1 00:00:06,160 --> 00:00:09,600 Speaker 1: Hey, welcome to Stuff to Blow Your Mind. This is 2 00:00:09,800 --> 00:00:12,479 Speaker 1: a holiday week for us, so today we have another 3 00:00:12,520 --> 00:00:14,760 Speaker 1: vault episode for you. This is going to be a 4 00:00:14,920 --> 00:00:18,599 Speaker 1: case of the urine sweats. This is an episode that 5 00:00:18,600 --> 00:00:23,279 Speaker 1: originally published eleven, nineteen, twenty twenty four, and we're going 6 00:00:23,360 --> 00:00:27,520 Speaker 1: to get into the avian habit of urinating and or 7 00:00:27,600 --> 00:00:32,160 Speaker 1: defecating onto the scaly parts of one's own legs. Let's 8 00:00:32,159 --> 00:00:33,199 Speaker 1: find out all about it. 9 00:00:36,760 --> 00:00:40,479 Speaker 2: Welcome to Stuff to Blow Your Mind, production of iHeartRadio. 10 00:00:46,440 --> 00:00:48,600 Speaker 1: Hey you, welcome to Stuff to Blow your Mind. My 11 00:00:48,680 --> 00:00:49,519 Speaker 1: name is Robert. 12 00:00:49,360 --> 00:00:53,000 Speaker 3: Lamb and I am Joe McCormick. And today on Stuff 13 00:00:53,000 --> 00:00:55,320 Speaker 3: to Blow Your Mind, we're going to be talking about 14 00:00:55,360 --> 00:00:59,280 Speaker 3: a concept called euro hydrosis. I'm not going to do 15 00:00:59,320 --> 00:01:02,760 Speaker 3: any see roundabout introduction. I think we owe it to 16 00:01:02,800 --> 00:01:05,120 Speaker 3: you to cut right to the chase, which is that 17 00:01:05,200 --> 00:01:08,440 Speaker 3: today we're going to be talking about the biological reasons 18 00:01:08,800 --> 00:01:13,280 Speaker 3: an animal might want to poop and pee all over itself. Yeah. 19 00:01:13,440 --> 00:01:16,520 Speaker 1: Yeah, this is gonna be one of those episodes. So 20 00:01:16,959 --> 00:01:20,479 Speaker 1: if you're not in the right headspace for this discussion, 21 00:01:20,520 --> 00:01:22,680 Speaker 1: you know, come back and listen to the episode another time. 22 00:01:22,760 --> 00:01:24,679 Speaker 1: But I think most of you are probably on board 23 00:01:24,680 --> 00:01:25,000 Speaker 1: for this. 24 00:01:25,520 --> 00:01:27,520 Speaker 3: So before we get to the reasons why, I think 25 00:01:27,560 --> 00:01:29,959 Speaker 3: we should start with just a kind of visual introduction 26 00:01:30,080 --> 00:01:34,600 Speaker 3: and observation, and it is that if you look at 27 00:01:34,680 --> 00:01:38,800 Speaker 3: some long legged birds strutting around in their natural habitat, 28 00:01:38,840 --> 00:01:42,080 Speaker 3: maybe wandering in the grass or on the rocks, foraging 29 00:01:42,200 --> 00:01:45,520 Speaker 3: for food or getting ready for mating, you will sometimes 30 00:01:45,640 --> 00:01:50,640 Speaker 3: see their legs covered in a pale residue. And Rob, 31 00:01:50,720 --> 00:01:53,080 Speaker 3: I'm attaching some images for you to look at here 32 00:01:53,080 --> 00:01:55,400 Speaker 3: in the outline, but people at home, you may want 33 00:01:55,400 --> 00:01:57,080 Speaker 3: to look these up for yourself when I give you 34 00:01:57,120 --> 00:02:00,280 Speaker 3: the names. So the examples I'm about to mention would 35 00:02:00,320 --> 00:02:05,360 Speaker 3: be three stork species. One is Seconia episcopus. This is 36 00:02:05,400 --> 00:02:10,640 Speaker 3: the wooly necked stork. Another one is Micteria leucocephala, which 37 00:02:10,680 --> 00:02:16,080 Speaker 3: is the painted stork, and another is Leptoptalus creminifer, the 38 00:02:16,160 --> 00:02:22,440 Speaker 3: marrabou stork. Now, these are all storks with long, thin legs, 39 00:02:22,760 --> 00:02:25,720 Speaker 3: I would say very roughly, you know, body length or 40 00:02:25,800 --> 00:02:29,920 Speaker 3: longer standing in an upright posture, and in the pictures 41 00:02:29,960 --> 00:02:32,760 Speaker 3: I've provided for you, Rob, these come from a paper 42 00:02:32,760 --> 00:02:34,440 Speaker 3: that we're going to talk about in just a minute, 43 00:02:34,680 --> 00:02:38,519 Speaker 3: you can see in patches that the legs and feet 44 00:02:39,000 --> 00:02:42,160 Speaker 3: have a natural pigmentation. They've got maybe a gray or 45 00:02:42,320 --> 00:02:45,160 Speaker 3: brown or black color on the skin of the legs 46 00:02:45,200 --> 00:02:48,360 Speaker 3: and feet. But in all three of these images, the 47 00:02:48,480 --> 00:02:52,320 Speaker 3: legs are mostly covered in some kind of white substance. 48 00:02:52,800 --> 00:02:54,840 Speaker 3: And if you had to guess what it is, what 49 00:02:54,840 --> 00:02:57,960 Speaker 3: would you think it is? Indeed, what you're probably thinking, 50 00:02:59,520 --> 00:02:59,840 Speaker 3: it's not. 51 00:03:00,200 --> 00:03:02,720 Speaker 1: It's not some sort of a glittery bomb, right, it's not. 52 00:03:03,400 --> 00:03:06,040 Speaker 1: It's not any kind of as we've discussed, it's not 53 00:03:06,280 --> 00:03:09,239 Speaker 1: clothing that they're wearing here over their their long legs. 54 00:03:09,440 --> 00:03:14,280 Speaker 3: It's something else, that's right. It is the bird's poop. Technically, 55 00:03:14,360 --> 00:03:16,640 Speaker 3: in mammal terms, you might want to say it is 56 00:03:16,680 --> 00:03:21,680 Speaker 3: both urine and feces, because birds deal with their excreta 57 00:03:21,800 --> 00:03:24,040 Speaker 3: in a kind of different way than mammals do. They 58 00:03:24,080 --> 00:03:26,360 Speaker 3: basically do it all in one go. It's not a 59 00:03:26,400 --> 00:03:28,720 Speaker 3: separate poop and p It's all one thing. 60 00:03:29,360 --> 00:03:33,040 Speaker 1: Yes, the Glory of the Cloaca, which long time listeners 61 00:03:33,080 --> 00:03:35,640 Speaker 1: to Stuff to Blow your Mind have a fair amount 62 00:03:35,680 --> 00:03:38,080 Speaker 1: of familiarity with, though I don't think we've done an 63 00:03:38,080 --> 00:03:42,640 Speaker 1: episode on the kloaca recently. An old episode on the cloaca. 64 00:03:42,960 --> 00:03:45,320 Speaker 3: Remember it's a classic from many years ago. I think 65 00:03:45,360 --> 00:03:46,760 Speaker 3: you and Julie did some cloaca. 66 00:03:47,160 --> 00:03:49,040 Speaker 1: Yeah, yeah, and then it's come up, you know, it 67 00:03:49,040 --> 00:03:53,280 Speaker 1: comes up anytime we're potentially talking about reproduction and digestion, 68 00:03:53,400 --> 00:03:57,160 Speaker 1: when you know, concerning birds and other animals. Sometimes it 69 00:03:57,200 --> 00:04:00,800 Speaker 1: pops up in discussions of prehistoric cree as well. 70 00:04:01,120 --> 00:04:03,360 Speaker 3: That's right. So with these animals, with the bird or 71 00:04:03,400 --> 00:04:08,480 Speaker 3: reptile lineage, you're going to be doing digestive waste, renal 72 00:04:08,520 --> 00:04:12,440 Speaker 3: system waste and reproduction is just all going in and 73 00:04:12,440 --> 00:04:15,960 Speaker 3: out the same hole, the kloaeca. So anyway, I got 74 00:04:15,960 --> 00:04:19,520 Speaker 3: interested in the concept of eurohydrosis, the idea that birds 75 00:04:19,560 --> 00:04:24,000 Speaker 3: would be intentionally having an adaptation to excrete waste all 76 00:04:24,000 --> 00:04:26,760 Speaker 3: over their own bodies, all over their own legs, and 77 00:04:26,920 --> 00:04:29,279 Speaker 3: so I was looking for scientific sources about this. So 78 00:04:29,400 --> 00:04:32,640 Speaker 3: I found a paper from twenty twenty one that lays 79 00:04:32,640 --> 00:04:35,000 Speaker 3: it all out pretty well. This is a paper in 80 00:04:35,040 --> 00:04:38,520 Speaker 3: the journal Scientific Reports, and I apologize if I pronounced 81 00:04:38,520 --> 00:04:40,719 Speaker 3: any of the author's names wrong. Here. It is by 82 00:04:41,080 --> 00:04:48,719 Speaker 3: Julian Kabeo Verguel, Andrea Soriano Redondo Auxiliadora Viegas Jose A. 83 00:04:49,000 --> 00:04:54,440 Speaker 3: Maseroje M. Sanchez Guzman and Jorge S. Gutierrez, and the 84 00:04:54,440 --> 00:04:58,760 Speaker 3: paper is called eurohydrosis as an overlooked cooling mechanism in 85 00:04:58,880 --> 00:05:04,920 Speaker 3: long legged birds. So basically all animals on Earth need 86 00:05:05,000 --> 00:05:08,200 Speaker 3: to regulate their internal body temperature, and there are a 87 00:05:08,240 --> 00:05:10,920 Speaker 3: lot of reasons for this. Of course, we're all basically 88 00:05:10,960 --> 00:05:15,080 Speaker 3: different types of water bags moving around and reproducing ourselves. 89 00:05:15,279 --> 00:05:17,960 Speaker 3: So at the extremes you need to manage yourself as 90 00:05:18,000 --> 00:05:20,400 Speaker 3: a water bag. You need to prevent your water content 91 00:05:20,440 --> 00:05:25,039 Speaker 3: from freezing solid or turning into steam. But beyond those extremes, 92 00:05:25,279 --> 00:05:28,400 Speaker 3: animals also need to keep their body temperature within a 93 00:05:28,440 --> 00:05:32,240 Speaker 3: fairly narrow range to protect cellular function and facilitate the 94 00:05:32,320 --> 00:05:35,200 Speaker 3: chemistry of metabolism, like there are certain enzymes in the 95 00:05:35,200 --> 00:05:37,240 Speaker 3: body that don't work right if they're outside of a 96 00:05:37,240 --> 00:05:41,080 Speaker 3: certain temperature range, and so forth. And there are broadly 97 00:05:41,279 --> 00:05:44,520 Speaker 3: two different ways that an animal species can be oriented 98 00:05:44,600 --> 00:05:47,720 Speaker 3: with respect to the regulation of body temperature. These are 99 00:05:47,760 --> 00:05:53,120 Speaker 3: ectothermy and endothermy. Endotherms also known as warm blooded animals 100 00:05:53,320 --> 00:05:57,760 Speaker 3: generate their own internal heat from metabolism, so they burn 101 00:05:58,040 --> 00:06:02,760 Speaker 3: food energy and use homeostatic mechanisms like shivering and sweating 102 00:06:02,800 --> 00:06:06,120 Speaker 3: and so forth to keep body temperature within a very 103 00:06:06,160 --> 00:06:11,360 Speaker 3: tight range. Mammals and birds are generally endotherms. They primarily 104 00:06:11,440 --> 00:06:16,480 Speaker 3: regulate their temperature with internal mechanisms. Ectotherms, on the other hand, 105 00:06:16,600 --> 00:06:20,919 Speaker 3: sometimes called cold blooded animals, regulate their body temperature mostly 106 00:06:20,960 --> 00:06:23,520 Speaker 3: with the help of the outside environment. So these are 107 00:06:23,560 --> 00:06:25,960 Speaker 3: the animals that you would think of as sun basking 108 00:06:26,080 --> 00:06:29,880 Speaker 3: or cooling in water in order to manage their body temperature. 109 00:06:30,200 --> 00:06:34,960 Speaker 3: Ectothermic animals include most reptiles, amphibians, and fish. Though to 110 00:06:35,000 --> 00:06:39,359 Speaker 3: be clear, the cut between ectothermy and endothermy is not 111 00:06:39,520 --> 00:06:41,680 Speaker 3: a clean cut. There are a lot of kind of 112 00:06:41,680 --> 00:06:47,040 Speaker 3: blurry cases in between, just sort of a generally helpful distinction. Now, 113 00:06:47,080 --> 00:06:50,520 Speaker 3: there are advantages to each of these major strategies. We 114 00:06:50,560 --> 00:06:53,080 Speaker 3: could come back and go deep on this someday, and 115 00:06:53,120 --> 00:06:54,960 Speaker 3: we've talked about it somewhat in the past, I believe, 116 00:06:54,960 --> 00:06:59,080 Speaker 3: But a very simplified version is that indotherms animals that 117 00:06:59,120 --> 00:07:03,320 Speaker 3: primarily rate their own heat through metabolism, they can do 118 00:07:03,480 --> 00:07:07,280 Speaker 3: a lot more. They can sustain more muscular activity, they 119 00:07:07,279 --> 00:07:10,360 Speaker 3: can grow more powerful brains, they can survive in a 120 00:07:10,400 --> 00:07:13,840 Speaker 3: greater range of different climates, you know you don't usually 121 00:07:13,920 --> 00:07:17,720 Speaker 3: see like reptiles and extremely cold climates and so forth. 122 00:07:17,880 --> 00:07:22,520 Speaker 3: But they also require a lot more food. Ectotherms are 123 00:07:22,600 --> 00:07:25,800 Speaker 3: efficient because they don't leave the motor running all the time. 124 00:07:25,920 --> 00:07:28,680 Speaker 3: They can usually go much longer in between meals and 125 00:07:28,760 --> 00:07:32,440 Speaker 3: can survive rough patches by kind of going dormant. Now, 126 00:07:32,480 --> 00:07:35,400 Speaker 3: because this paper is focused on birds, we're in the 127 00:07:35,400 --> 00:07:39,680 Speaker 3: domain of the indotherms, the warm blooded animals that primarily 128 00:07:39,760 --> 00:07:44,280 Speaker 3: generate heat through their own internal metabolic mechanisms. But even 129 00:07:44,480 --> 00:07:49,520 Speaker 3: endotherms can't regulate everything internally, and the authors begin the 130 00:07:49,520 --> 00:07:53,960 Speaker 3: paper by discussing various ways that endothermic animals do still 131 00:07:54,040 --> 00:07:58,360 Speaker 3: have to protect themselves from external heat stress, from getting 132 00:07:58,400 --> 00:08:01,720 Speaker 3: too hot because the environment is too hot. And some 133 00:08:01,760 --> 00:08:06,200 Speaker 3: of these defense mechanisms against overheating are physiological and some 134 00:08:06,440 --> 00:08:10,680 Speaker 3: are what you'd probably call behavioral, and the authors say 135 00:08:10,720 --> 00:08:14,760 Speaker 3: that typically the first response, the first priority response, in 136 00:08:14,840 --> 00:08:17,680 Speaker 3: the responses you go through when you're encountering heat stress 137 00:08:18,160 --> 00:08:23,080 Speaker 3: is behavioral, and this could involve the selection of cooler microclimates, 138 00:08:23,160 --> 00:08:26,760 Speaker 3: going to cooler places from warmer places, or what they 139 00:08:26,760 --> 00:08:31,080 Speaker 3: call heat dissipating behaviors, And there are many different kinds 140 00:08:31,120 --> 00:08:34,559 Speaker 3: of heat dissipating behaviors in nature. This could mean something 141 00:08:34,600 --> 00:08:38,840 Speaker 3: as simple and as familiar to us as reducing physical activity. 142 00:08:38,920 --> 00:08:41,280 Speaker 3: You know, it's hot out, you stop moving around so much, 143 00:08:42,640 --> 00:08:45,360 Speaker 3: or moving out of the sun and into the shade, 144 00:08:46,360 --> 00:08:48,800 Speaker 3: or things like getting in the water for a swim. 145 00:08:49,200 --> 00:08:52,559 Speaker 3: Being submerged, even in what feels like fairly warm water, 146 00:08:52,920 --> 00:08:56,319 Speaker 3: actually removes heat from the body quite efficiently. The author 147 00:08:56,400 --> 00:08:59,760 Speaker 3: is mentioned later in the paper that the thermal conductivity of 148 00:08:59,800 --> 00:09:03,600 Speaker 3: water is twenty five times that of air. So you're 149 00:09:04,240 --> 00:09:07,160 Speaker 3: you might have had this experience before where you know, 150 00:09:07,240 --> 00:09:09,680 Speaker 3: even in a pool that doesn't feel very cold, the 151 00:09:09,679 --> 00:09:12,120 Speaker 3: water feels nice and warm. You spend too long in 152 00:09:12,160 --> 00:09:15,000 Speaker 3: the pool, you really will start to chill out and 153 00:09:15,040 --> 00:09:16,920 Speaker 3: you need to get out of the water and warm up. 154 00:09:17,520 --> 00:09:20,040 Speaker 1: Yeah, so you can basically could basically like roleplay all 155 00:09:20,080 --> 00:09:23,000 Speaker 1: of these like you almost have like an innate pull 156 00:09:23,080 --> 00:09:26,240 Speaker 1: towards these various thermoregulation options. You know, if we were 157 00:09:26,280 --> 00:09:30,600 Speaker 1: to position you, say, you know, a nice pool patio 158 00:09:30,960 --> 00:09:33,560 Speaker 1: on a hot summer day, what are some of your options? 159 00:09:33,600 --> 00:09:35,480 Speaker 1: You know, do you choose the umbrella, do you choose 160 00:09:35,480 --> 00:09:37,959 Speaker 1: the pool, do you choose the shade of the house 161 00:09:38,000 --> 00:09:38,640 Speaker 1: and so forth. 162 00:09:39,040 --> 00:09:41,800 Speaker 3: That's right. And then there's another class of heat dissipating 163 00:09:41,840 --> 00:09:46,440 Speaker 3: behaviors which could be called like posteral adjustments, and this 164 00:09:46,480 --> 00:09:49,000 Speaker 3: could be just positioning the body in different ways to 165 00:09:49,200 --> 00:09:52,720 Speaker 3: maximize how much heat it is getting rid of. One 166 00:09:52,760 --> 00:09:56,160 Speaker 3: example is spreading out the body tissues to increase your 167 00:09:56,200 --> 00:09:59,280 Speaker 3: surface area. So think about how when you're cold, you 168 00:09:59,360 --> 00:10:01,600 Speaker 3: kind of try to s shrink down, don't you. You 169 00:10:01,640 --> 00:10:04,560 Speaker 3: try to shrink your body into a ball and reduce 170 00:10:04,600 --> 00:10:07,280 Speaker 3: your surface area. You might hug your arms into yourself 171 00:10:07,360 --> 00:10:09,720 Speaker 3: and kind of kind of crouch. But in the heat, 172 00:10:09,800 --> 00:10:12,840 Speaker 3: if you're overheating, you don't want your legs touching each other, 173 00:10:12,920 --> 00:10:14,880 Speaker 3: and you don't want your arms touching your body. You 174 00:10:14,920 --> 00:10:18,240 Speaker 3: want to splay out maximally to have maximal surface area, 175 00:10:18,520 --> 00:10:22,080 Speaker 3: which means heat can escape your body with the greatest efficiency. 176 00:10:22,600 --> 00:10:24,960 Speaker 1: Or you might want to fan out your neural spine 177 00:10:25,000 --> 00:10:27,800 Speaker 1: sale for a yes, or if you want to regulate 178 00:10:27,800 --> 00:10:30,560 Speaker 1: your temperature that way. If you have a neural spine sale, 179 00:10:30,640 --> 00:10:32,400 Speaker 1: I'm not going to presume everyone has one. 180 00:10:32,880 --> 00:10:35,160 Speaker 3: Or if you're a bird, you might want to fold 181 00:10:35,520 --> 00:10:37,960 Speaker 3: unfold your wings, hold your wings out to let you 182 00:10:37,960 --> 00:10:40,680 Speaker 3: know heat radiate that way. You know, different animals exactly 183 00:10:40,720 --> 00:10:43,160 Speaker 3: the spine sales. This is a great example. You know, 184 00:10:43,240 --> 00:10:46,240 Speaker 3: different animals have different ways of increasing their surface area 185 00:10:46,400 --> 00:10:50,360 Speaker 3: and radiating more heat. Now, if the endothermic animal cannot 186 00:10:50,520 --> 00:10:54,079 Speaker 3: escape heat stress with just the behavioral responses, it has 187 00:10:54,160 --> 00:10:59,640 Speaker 3: to switch gears into what the authors call rapid physiological adjustments. 188 00:11:00,080 --> 00:11:02,960 Speaker 3: This is things that the body does we would usually 189 00:11:03,000 --> 00:11:06,400 Speaker 3: think of as involuntarily to try to remove heat faster. 190 00:11:07,040 --> 00:11:09,920 Speaker 3: And these can vary across different types of animals, but 191 00:11:10,120 --> 00:11:14,280 Speaker 3: it could include things like in humans, sweating, in other animals, 192 00:11:14,360 --> 00:11:18,160 Speaker 3: panting or increasing the breathing rate to dissipate more heat 193 00:11:18,200 --> 00:11:21,920 Speaker 3: from the lungs and the respiratory system. Now, the authors 194 00:11:21,920 --> 00:11:25,760 Speaker 3: point out that in birds, one of the most common 195 00:11:25,800 --> 00:11:29,920 Speaker 3: physiological mechanisms for removing heat is what they call panting. 196 00:11:30,320 --> 00:11:34,679 Speaker 3: I've seen some sources reject that terminology, maybe because they 197 00:11:34,720 --> 00:11:37,360 Speaker 3: think it incorrectly implies it's the exact same thing that 198 00:11:37,440 --> 00:11:42,240 Speaker 3: dogs do, But it's similar either way. For birds, panting 199 00:11:42,280 --> 00:11:45,840 Speaker 3: involves rapid breathing with an open mouth. They might hold 200 00:11:45,880 --> 00:11:48,760 Speaker 3: the bill open and breathe in and out very rapidly 201 00:11:48,800 --> 00:11:52,679 Speaker 3: to purge heat through evaporation from the warm, moist tissues 202 00:11:52,720 --> 00:11:56,560 Speaker 3: inside the mouth, throat, and lungs. This is also sometimes 203 00:11:56,559 --> 00:12:01,640 Speaker 3: accompanied by another response called gooler fluttering u laar fluttering, 204 00:12:02,000 --> 00:12:05,680 Speaker 3: which means like they would, the bird will vigorously vibrate 205 00:12:05,720 --> 00:12:09,280 Speaker 3: the muscles and membranes inside its throat while panting to 206 00:12:09,480 --> 00:12:14,040 Speaker 3: further increase evaporation and the purging of heat. Now, these 207 00:12:14,040 --> 00:12:18,240 Speaker 3: physiological adjustments, they do work. They will purge heat from 208 00:12:18,280 --> 00:12:22,000 Speaker 3: the body and help avoid hyperthermia, help the animal cool down, 209 00:12:22,320 --> 00:12:26,720 Speaker 3: but they're also very costly. They're costly and thus risky 210 00:12:26,800 --> 00:12:30,960 Speaker 3: to the animal because they can waste important resources like 211 00:12:31,200 --> 00:12:35,120 Speaker 3: energy and water. Birds can lose a lot of water 212 00:12:35,600 --> 00:12:39,360 Speaker 3: through panting and fluttering, and in addition, the authors mentioned 213 00:12:39,400 --> 00:12:43,400 Speaker 3: that panting in birds can force potentially undesirable changes in 214 00:12:43,440 --> 00:12:46,800 Speaker 3: blood chemistry. So, if you're an animal in the wild 215 00:12:46,920 --> 00:12:51,960 Speaker 3: fighting for survival, you know you have these physiological mechanisms, 216 00:12:52,000 --> 00:12:55,320 Speaker 3: these sort of rapid body adjustments that you can rely 217 00:12:55,400 --> 00:12:58,080 Speaker 3: on if you have to, but you would like to 218 00:12:58,120 --> 00:13:00,520 Speaker 3: avoid them. You would like to avoid going into these 219 00:13:00,559 --> 00:13:04,160 Speaker 3: wasteful physiological protections against heat if you can help it, 220 00:13:04,440 --> 00:13:07,840 Speaker 3: and the more efficient behavioral methods should be your first 221 00:13:07,880 --> 00:13:10,920 Speaker 3: line of defense. So for a human analogy, it's usually 222 00:13:10,960 --> 00:13:13,560 Speaker 3: it's going to be less costly to your body to 223 00:13:13,720 --> 00:13:15,599 Speaker 3: just get into the shade and get out of the 224 00:13:15,640 --> 00:13:19,480 Speaker 3: heat than it is to start sweating bullets. In their introduction, 225 00:13:19,600 --> 00:13:22,520 Speaker 3: the authors of this paper introduce a concept from zoology 226 00:13:22,559 --> 00:13:28,080 Speaker 3: called heat dissipation limit theory, which argues that in indotherms, 227 00:13:28,360 --> 00:13:31,559 Speaker 3: the problem of how to deal with excess heat produced 228 00:13:31,600 --> 00:13:35,200 Speaker 3: by metabolism limits how much energy you can take in 229 00:13:35,400 --> 00:13:39,480 Speaker 3: and by consequence, limits reproductive output. So the author is 230 00:13:39,559 --> 00:13:43,320 Speaker 3: right that under this theory, heat dissipation behaviors could really 231 00:13:43,360 --> 00:13:46,880 Speaker 3: be crucial to the evolutionary success of a species because 232 00:13:46,920 --> 00:13:50,520 Speaker 3: they allow more chemical energy to be devoted to foraging 233 00:13:50,559 --> 00:13:54,319 Speaker 3: and reproduction and things like that, rather than to physiological 234 00:13:54,360 --> 00:13:57,439 Speaker 3: mechanisms simply for getting excess heat out of the body. 235 00:13:58,040 --> 00:14:01,200 Speaker 3: And the author is mentioned that the sort of research 236 00:14:01,320 --> 00:14:05,920 Speaker 3: context of this paper is that thermoregulatory behaviors and animals 237 00:14:05,960 --> 00:14:09,160 Speaker 3: are increasingly being studied because of the current and future 238 00:14:09,240 --> 00:14:12,520 Speaker 3: increases in heat stress on wildlife due to global warming, 239 00:14:12,920 --> 00:14:15,560 Speaker 3: where the ability of an animal species to deal with 240 00:14:15,640 --> 00:14:20,040 Speaker 3: heat stress without resorting to costly physiological mechanisms may be 241 00:14:20,200 --> 00:14:23,200 Speaker 3: the difference between adaptation and extinction, So this is something 242 00:14:23,200 --> 00:14:25,720 Speaker 3: that is probably just going to get more and more 243 00:14:26,080 --> 00:14:29,400 Speaker 3: attention from people who study wildlife, especially as the heat 244 00:14:29,480 --> 00:14:44,320 Speaker 3: stresses of environments are changing more rapidly. Now, another interesting 245 00:14:44,400 --> 00:14:49,040 Speaker 3: fact about how birds protect themselves against overheating has to 246 00:14:49,080 --> 00:14:52,280 Speaker 3: do with what the authors call quote unfeathered and well 247 00:14:52,400 --> 00:14:57,240 Speaker 3: vascularized appendages, meaning parts of the body that are bare 248 00:14:57,320 --> 00:15:00,760 Speaker 3: so not covered in feathers, and parts of the body 249 00:15:00,800 --> 00:15:04,360 Speaker 3: containing a lot of blood vessels. And examples here would 250 00:15:04,400 --> 00:15:07,560 Speaker 3: be the bill, the bird's bill around the mouth, and 251 00:15:07,800 --> 00:15:10,840 Speaker 3: the legs. Because these parts of the body are typically 252 00:15:10,960 --> 00:15:15,560 Speaker 3: not insulated by feathers and lots of blood flows through them, 253 00:15:15,960 --> 00:15:18,360 Speaker 3: and for these two reasons, these parts of the body 254 00:15:18,400 --> 00:15:20,880 Speaker 3: can be utilized pretty well as what the authors call 255 00:15:21,040 --> 00:15:25,640 Speaker 3: thermal radiators to purge excess heat, and this is especially 256 00:15:25,680 --> 00:15:30,000 Speaker 3: the case for storks. The storks belong to the in 257 00:15:30,120 --> 00:15:35,400 Speaker 3: scientific classification, they belong to the family Sickniady, which storks 258 00:15:35,400 --> 00:15:39,680 Speaker 3: typically have long, bare legs and most often live in 259 00:15:39,800 --> 00:15:44,360 Speaker 3: warm or hot climates with little shade. So storks have 260 00:15:44,400 --> 00:15:49,160 Speaker 3: an internal mechanism for making use of these thermal radiators 261 00:15:49,160 --> 00:15:51,640 Speaker 3: in the body for making use of the long legs 262 00:15:51,960 --> 00:15:56,720 Speaker 3: for temperature management. Storks can actually alter the blood flow 263 00:15:56,800 --> 00:16:00,480 Speaker 3: to their legs, constricting the blood vessels down the when 264 00:16:00,480 --> 00:16:03,000 Speaker 3: it's cold out so less blood is flowing through and 265 00:16:03,000 --> 00:16:06,320 Speaker 3: there's less heat exchange, and then dilating the blood vessels 266 00:16:06,320 --> 00:16:08,960 Speaker 3: in the legs when it's hot, promoting more heat loss 267 00:16:09,000 --> 00:16:11,640 Speaker 3: from the body down in the legs. But in the 268 00:16:11,640 --> 00:16:14,640 Speaker 3: case of storks, the use of the legs as thermal 269 00:16:14,720 --> 00:16:17,680 Speaker 3: radiators goes one step further, and here's where we get 270 00:16:17,720 --> 00:16:23,560 Speaker 3: back to the topic for today. Eurohydrosis the author's right quote. Notably, 271 00:16:23,760 --> 00:16:28,400 Speaker 3: storks can deliberately excrete onto their legs when exposed to 272 00:16:28,560 --> 00:16:34,640 Speaker 3: increasing environmental temperatures, a phenomenon known as eurohydrosis. When overheated, 273 00:16:34,840 --> 00:16:39,520 Speaker 3: storks repeatedly direct liquid xcrita toward their legs, only one 274 00:16:39,600 --> 00:16:43,840 Speaker 3: leg at a time, which usually evaporates before reaching the toes. 275 00:16:44,920 --> 00:16:47,960 Speaker 3: So it's hard to imagine this from a human perspective, 276 00:16:48,040 --> 00:16:49,560 Speaker 3: but the more you think about it, the more it 277 00:16:49,600 --> 00:16:52,960 Speaker 3: does make biological sense. Imagine you're out in the sun 278 00:16:53,160 --> 00:16:56,200 Speaker 3: on a blazing summer day. The heat's really getting to you. 279 00:16:56,200 --> 00:16:58,680 Speaker 3: You have a few options to cope. You could stop 280 00:16:58,720 --> 00:17:01,400 Speaker 3: moving around and fly down in a chair. You could 281 00:17:01,440 --> 00:17:03,280 Speaker 3: get out of the sun and into the shade. You 282 00:17:03,280 --> 00:17:06,720 Speaker 3: could hop into a pool. Or if those options are 283 00:17:06,760 --> 00:17:09,240 Speaker 3: not really available to you at the moment, you could 284 00:17:09,440 --> 00:17:12,240 Speaker 3: poop all over your own legs, one leg at a time, 285 00:17:12,520 --> 00:17:15,000 Speaker 3: and then hope that that helps cool you off. 286 00:17:15,800 --> 00:17:20,960 Speaker 1: Granted, there are certain consistency challenges here. Yes, yes, some 287 00:17:21,040 --> 00:17:24,200 Speaker 1: dietary adjustments might be necessary in order to ensure this 288 00:17:24,560 --> 00:17:27,560 Speaker 1: as a viable tactic for human beings. But I think 289 00:17:27,760 --> 00:17:29,760 Speaker 1: we all have great imaginations we can see it. 290 00:17:30,119 --> 00:17:32,639 Speaker 3: I'm not recommending this as a tactic for human beings. 291 00:17:32,960 --> 00:17:35,000 Speaker 3: I don't know that this would work for a human. 292 00:17:35,080 --> 00:17:37,159 Speaker 3: It might be a bad trade off. But it works 293 00:17:37,200 --> 00:17:40,240 Speaker 3: for the storks. But the question is how does it 294 00:17:40,240 --> 00:17:42,840 Speaker 3: work for the stork? How does it cool the body? Well, 295 00:17:42,960 --> 00:17:46,080 Speaker 3: it is actually the same physical principle at work as 296 00:17:46,440 --> 00:17:51,000 Speaker 3: many other thermoregulation techniques in nature. It is evaporative cooling. 297 00:17:51,880 --> 00:17:54,320 Speaker 3: We've talked about evaporative cooling and a number of contexts 298 00:17:54,320 --> 00:17:56,080 Speaker 3: on the show before. I think we did an invention 299 00:17:56,280 --> 00:18:00,920 Speaker 3: series on the history of air conditioning. The air conditioning 300 00:18:01,119 --> 00:18:03,480 Speaker 3: where we talked a lot about evaporative cooling, and it's 301 00:18:03,480 --> 00:18:06,399 Speaker 3: come up in a biological context as well. But the 302 00:18:06,440 --> 00:18:10,879 Speaker 3: short version is that the phase transition from liquid water 303 00:18:11,160 --> 00:18:14,720 Speaker 3: into water vapor requires a lot of heat energy to 304 00:18:14,840 --> 00:18:18,359 Speaker 3: take place. So water that is evaporating into the air 305 00:18:18,920 --> 00:18:23,119 Speaker 3: cools down very rapidly and in turn cools whatever it 306 00:18:23,200 --> 00:18:25,520 Speaker 3: is touching, such as your body if it's on the 307 00:18:25,520 --> 00:18:28,280 Speaker 3: surface of your skin. And if you ever want to 308 00:18:28,280 --> 00:18:31,840 Speaker 3: do a simple experiment in your home to see evaporative 309 00:18:31,840 --> 00:18:34,400 Speaker 3: cooling at work, you can try. This is kind of fun. 310 00:18:34,440 --> 00:18:36,280 Speaker 3: You can get two bottles of water at the same 311 00:18:36,280 --> 00:18:39,560 Speaker 3: temperature room temperature bottles of water, and you put them 312 00:18:39,600 --> 00:18:42,160 Speaker 3: both in front of a fan, and now one you 313 00:18:42,240 --> 00:18:44,679 Speaker 3: just sit there with nothing, you know, by itself, but 314 00:18:44,720 --> 00:18:47,439 Speaker 3: the other one wrap the bottle in a wet towel, 315 00:18:47,920 --> 00:18:50,160 Speaker 3: set them both in front of the fan, and then 316 00:18:50,320 --> 00:18:53,520 Speaker 3: come back in like half an hour. The regular bottle 317 00:18:53,680 --> 00:18:56,879 Speaker 3: will not have cooled off significantly, but the bottle that 318 00:18:56,920 --> 00:19:00,160 Speaker 3: you wrapped in a wet towel will be very cold 319 00:19:00,240 --> 00:19:03,640 Speaker 3: because as airflow from the fan causes the water in 320 00:19:03,680 --> 00:19:07,399 Speaker 3: the wet towel to quickly evaporate, it will suck heat 321 00:19:07,480 --> 00:19:09,760 Speaker 3: from the water in the bottle and make it cold. 322 00:19:10,920 --> 00:19:12,720 Speaker 3: I think this is an old trick that like people 323 00:19:12,800 --> 00:19:16,440 Speaker 3: traveling in desert climates, you know, without artificial cooling used 324 00:19:16,440 --> 00:19:18,679 Speaker 3: to use where they would, you know, they'd have like 325 00:19:18,720 --> 00:19:21,280 Speaker 3: a big jug of water, like a big skin of water, 326 00:19:21,359 --> 00:19:23,600 Speaker 3: and to keep it cool as they're traveling in the 327 00:19:23,640 --> 00:19:26,800 Speaker 3: hot desert sun, they would also get like a cloth 328 00:19:26,840 --> 00:19:28,520 Speaker 3: and wet it at the beginning of the day and 329 00:19:28,560 --> 00:19:31,320 Speaker 3: wrap it around the outside of this skin of water. 330 00:19:31,640 --> 00:19:34,840 Speaker 3: And as the water evaporates from the hot cloth on 331 00:19:34,880 --> 00:19:37,080 Speaker 3: the outside through the day under the hot sun, it 332 00:19:37,200 --> 00:19:39,760 Speaker 3: sucks heat from the water inside and makes the water 333 00:19:39,880 --> 00:19:44,600 Speaker 3: very cold. And evaporative cooling is why sweating cools the body. 334 00:19:44,720 --> 00:19:48,640 Speaker 3: You know, as sweat evaporates from your skin, it steals 335 00:19:48,640 --> 00:19:51,840 Speaker 3: heat energy from your body and it cools you off. Now, 336 00:19:51,880 --> 00:19:54,240 Speaker 3: of course, sweating has a downside, which is that it 337 00:19:54,359 --> 00:19:58,760 Speaker 3: causes you to lose water and electrolytes. So when you're 338 00:19:58,760 --> 00:20:01,439 Speaker 3: hot and sweaty, it's very important to keep hydrated to 339 00:20:01,440 --> 00:20:04,480 Speaker 3: compensate for the water loss. Exercising in the hot sun 340 00:20:04,560 --> 00:20:06,440 Speaker 3: one oh one, you got to drink lots of fluids. 341 00:20:07,880 --> 00:20:11,199 Speaker 3: The same is true for birds. Now, birds don't sweat, 342 00:20:11,480 --> 00:20:14,520 Speaker 3: they don't have sweat glands, they can't sweat, but they 343 00:20:14,560 --> 00:20:17,280 Speaker 3: do have their own evaporative cooling techniques, and as we 344 00:20:17,359 --> 00:20:20,000 Speaker 3: talked about, the panting is one of those techniques where 345 00:20:20,000 --> 00:20:23,199 Speaker 3: they can use evaporative cooling in their respiratory system with 346 00:20:23,280 --> 00:20:27,880 Speaker 3: the open bill rapid breathing, and eurohydrosis is one of 347 00:20:27,920 --> 00:20:32,120 Speaker 3: these techniques. The author's right that eurohydrosis is relatively rare 348 00:20:32,240 --> 00:20:36,560 Speaker 3: among birds because it requires ready access to a lot 349 00:20:36,600 --> 00:20:39,960 Speaker 3: of drinking water, but plenty of bird groups have been 350 00:20:40,359 --> 00:20:46,119 Speaker 3: observed to do it. They list New World vultures, storks, condors, gannets, 351 00:20:46,240 --> 00:20:50,359 Speaker 3: and boobies. And eurohodrosis has been known about for a 352 00:20:50,359 --> 00:20:52,520 Speaker 3: long time, but the authors say there still has been 353 00:20:52,920 --> 00:20:58,359 Speaker 3: relatively little investigation of what exactly are the environmental and 354 00:20:58,440 --> 00:21:03,399 Speaker 3: physiological factors that determine it, like what causes one bird 355 00:21:03,440 --> 00:21:07,199 Speaker 3: group to use eurohedrosis and another group do not use it. 356 00:21:08,080 --> 00:21:10,199 Speaker 3: So the authors came up with a systematic way of 357 00:21:10,240 --> 00:21:15,640 Speaker 3: looking into this. Now, this particular study relied on essentially 358 00:21:15,840 --> 00:21:21,159 Speaker 3: repositories of scientific media, like imagery of birds from various 359 00:21:21,160 --> 00:21:24,679 Speaker 3: field locations that was associated with metadata, so that you 360 00:21:24,680 --> 00:21:28,600 Speaker 3: could try to correlate like images of birds doing certain 361 00:21:28,640 --> 00:21:32,919 Speaker 3: things and the environmental data about them. So this was 362 00:21:33,000 --> 00:21:37,879 Speaker 3: not direct field test with variables that the authors could manipulate, 363 00:21:38,440 --> 00:21:41,119 Speaker 3: but they were just trying to establish correlations between like 364 00:21:41,200 --> 00:21:45,360 Speaker 3: environmental factors and factors about the bird's bodies, along with 365 00:21:45,480 --> 00:21:48,639 Speaker 3: observations of do these birds poop on their own legs 366 00:21:48,720 --> 00:21:53,040 Speaker 3: or not? So what environmental factors did they find correlating 367 00:21:53,119 --> 00:21:57,000 Speaker 3: with the use of eurohydrosis by storks? The authors found 368 00:21:57,080 --> 00:22:01,879 Speaker 3: that high temperatures, high solar radiation in higher air humidity, 369 00:22:02,000 --> 00:22:06,200 Speaker 3: and low wind speed were all factors that would increase 370 00:22:06,440 --> 00:22:10,720 Speaker 3: the baseline heat stress risk for an endothermic animal, and 371 00:22:11,000 --> 00:22:14,520 Speaker 3: storks in environments with all of these conditions were more 372 00:22:14,720 --> 00:22:18,800 Speaker 3: likely to engage in eurohydrosis. They also found that it 373 00:22:18,840 --> 00:22:22,119 Speaker 3: was more common among stork species that forage on dry 374 00:22:22,280 --> 00:22:26,200 Speaker 3: land as opposed to those that commonly inhabit water bodies 375 00:22:26,240 --> 00:22:29,600 Speaker 3: and forage by wading, which kind of makes sense to me, Like, 376 00:22:29,640 --> 00:22:32,440 Speaker 3: if you can get your legs wet without pooping on them, 377 00:22:32,480 --> 00:22:35,399 Speaker 3: all the better, right, But some storks are not in 378 00:22:35,440 --> 00:22:38,080 Speaker 3: a position to spend as much time hanging out in 379 00:22:38,160 --> 00:22:38,920 Speaker 3: the water. 380 00:22:39,240 --> 00:22:43,520 Speaker 1: Right right, Or you're dealing with water that's very shallow. Yeah, 381 00:22:43,600 --> 00:22:45,960 Speaker 1: you know, we've all seen storks in the wild, I think, 382 00:22:46,000 --> 00:22:48,560 Speaker 1: and yeah, yeah, sometimes they're in very shallow waters. 383 00:22:49,200 --> 00:22:52,800 Speaker 3: Now, even storks that sometimes wide in water do apparently 384 00:22:52,920 --> 00:22:56,919 Speaker 3: use eurohydrosis, just less often. For these species. It may 385 00:22:56,960 --> 00:23:00,919 Speaker 3: be more limited to times when circums stances create a 386 00:23:01,000 --> 00:23:04,400 Speaker 3: higher heat risk, such as during reproduction when they need 387 00:23:04,440 --> 00:23:05,919 Speaker 3: to be out of the water in the heat for 388 00:23:06,000 --> 00:23:09,880 Speaker 3: extended time. But anyway, the authors say that the hypothesis 389 00:23:09,880 --> 00:23:14,679 Speaker 3: that eurohydrosis correlates to open and warm habitats was confirmed. 390 00:23:14,840 --> 00:23:16,960 Speaker 3: Birds that sort of live out in the open in 391 00:23:17,000 --> 00:23:19,280 Speaker 3: hot places, they're the ones that are going to be 392 00:23:19,280 --> 00:23:23,240 Speaker 3: more likely to do this to help cool their bodies. Now, 393 00:23:23,280 --> 00:23:26,199 Speaker 3: there were some other hypotheses that had been put forward 394 00:23:26,240 --> 00:23:29,119 Speaker 3: by these authors and other authors that were not confirmed 395 00:23:29,480 --> 00:23:34,560 Speaker 3: in this research. It had been hypothesized that stork pigmentation 396 00:23:34,840 --> 00:23:38,480 Speaker 3: would be correlated to the use of eurohydrosis. The ideas 397 00:23:38,560 --> 00:23:42,680 Speaker 3: maybe that birds with darker pigmentation absorbed more heat from 398 00:23:42,680 --> 00:23:45,919 Speaker 3: the sun, but this was not supported by the survey. 399 00:23:45,960 --> 00:23:48,560 Speaker 3: They did not find that correlation. It had also been 400 00:23:48,640 --> 00:23:54,040 Speaker 3: hypothesized that eurohydrosis would directly correlate to the latitude where 401 00:23:54,040 --> 00:23:57,720 Speaker 3: birds live, with tropical species practicing it more. This was 402 00:23:57,760 --> 00:24:02,400 Speaker 3: also not strictly supported, though again there's some complications because 403 00:24:02,440 --> 00:24:04,120 Speaker 3: some of these birds, you know, they will travel, live 404 00:24:04,160 --> 00:24:08,840 Speaker 3: at different latitudes different parts of the year, and again warmer, 405 00:24:09,040 --> 00:24:11,480 Speaker 3: more open environments did predict it, it was just not 406 00:24:11,640 --> 00:24:15,800 Speaker 3: strictly latitude. Another thing that was not supported was a 407 00:24:15,880 --> 00:24:19,080 Speaker 3: hypothesis about body mass. This was something that the authors 408 00:24:19,080 --> 00:24:22,600 Speaker 3: of this paper predicted. They thought that higher body mass 409 00:24:22,600 --> 00:24:26,639 Speaker 3: would predict more eurohydrosis because the animal would have more 410 00:24:26,720 --> 00:24:29,719 Speaker 3: water reserves to take advantage of, Like if you're you know, 411 00:24:29,800 --> 00:24:32,359 Speaker 3: you're a bigger animal, you can drink more water, store 412 00:24:32,400 --> 00:24:35,400 Speaker 3: more water in the body. You can also you've got 413 00:24:35,440 --> 00:24:38,160 Speaker 3: more to you know, to waste in pooping on your 414 00:24:38,160 --> 00:24:41,560 Speaker 3: own legs to cool off. But this was actually not 415 00:24:41,720 --> 00:24:43,800 Speaker 3: the case. This might have to do with the fact 416 00:24:43,920 --> 00:24:46,919 Speaker 3: that these storks all had access to water bodies for 417 00:24:46,960 --> 00:24:49,560 Speaker 3: regular drinking, even if they didn't spend a lot of 418 00:24:49,600 --> 00:24:53,240 Speaker 3: their time waiting around in that water, so maybe internal 419 00:24:53,280 --> 00:24:57,760 Speaker 3: water stores were less of a concern. Looking beyond storks, 420 00:24:57,880 --> 00:25:00,480 Speaker 3: the authors note that even other bird gre groups that 421 00:25:00,800 --> 00:25:05,480 Speaker 3: practice heurohydrosis, like New World vultures, boobies, and gannets. They 422 00:25:05,520 --> 00:25:09,520 Speaker 3: all tend to breed or forage in hot, open land 423 00:25:09,680 --> 00:25:12,359 Speaker 3: areas under the sun, and they also tend to have 424 00:25:12,440 --> 00:25:17,520 Speaker 3: relatively large and highly vascularized legs, so there seem to 425 00:25:17,600 --> 00:25:22,000 Speaker 3: be some common environmental and physiological pressures at work. Now, 426 00:25:22,040 --> 00:25:25,440 Speaker 3: some other interesting observations from their conclusion I thought one 427 00:25:25,480 --> 00:25:28,479 Speaker 3: was that when comparing different ways of cooling the body 428 00:25:28,520 --> 00:25:31,720 Speaker 3: at the cost of energy and water reserves, the authors 429 00:25:31,760 --> 00:25:37,040 Speaker 3: conclude that eurohydrosis is actually cheaper than panting, which was 430 00:25:37,080 --> 00:25:39,560 Speaker 3: kind of surprising to me that that was counterintuitive, but 431 00:25:39,720 --> 00:25:42,720 Speaker 3: they said this is supported by the fact that birds 432 00:25:42,760 --> 00:25:46,560 Speaker 3: who have the adaptation tend to engage in leg pooping 433 00:25:46,720 --> 00:25:51,040 Speaker 3: at a lower temperature threshold than the temperature threshold for panting. 434 00:25:51,840 --> 00:25:53,919 Speaker 3: So I think kind of like how if you're a human, 435 00:25:54,240 --> 00:25:57,720 Speaker 3: humans will typically resort to like changing into short sleeves 436 00:25:57,840 --> 00:26:01,000 Speaker 3: before they will resort to like jumping into ice water bath. 437 00:26:01,119 --> 00:26:04,000 Speaker 3: You know, one is like a more severe costly activity 438 00:26:04,040 --> 00:26:07,560 Speaker 3: than the other, And it seems like for these birds, 439 00:26:07,680 --> 00:26:11,679 Speaker 3: panting is the more severe, more costly, and risky activity. 440 00:26:12,359 --> 00:26:15,639 Speaker 3: The authors also note that other animals, apart from birds, 441 00:26:16,080 --> 00:26:20,920 Speaker 3: use alternative evaporative cooling methods, not just not just sweating 442 00:26:21,040 --> 00:26:24,879 Speaker 3: like we do. They say some mammals produce excess saliva 443 00:26:24,920 --> 00:26:27,840 Speaker 3: when hot and then use evaporative cooling through the mouth 444 00:26:27,960 --> 00:26:30,719 Speaker 3: or even cool the body by like drooling or licking 445 00:26:30,720 --> 00:26:33,639 Speaker 3: on themselves on the outside and then allowing that saliva 446 00:26:33,720 --> 00:26:37,919 Speaker 3: to evaporate. Rob I know, you've got an alternative evaporative 447 00:26:37,920 --> 00:26:41,639 Speaker 3: cooling method to talk about in a minute. But they 448 00:26:41,720 --> 00:26:45,800 Speaker 3: end up saying that there could be some tradeoffs involved here. 449 00:26:45,880 --> 00:26:49,120 Speaker 3: There's possibly that this is not a strong not something 450 00:26:49,119 --> 00:26:52,359 Speaker 3: they strongly established, but a possibility is that there could 451 00:26:52,359 --> 00:26:56,400 Speaker 3: be a tradeoff between mate signaling based on the pigmentation 452 00:26:56,600 --> 00:27:00,199 Speaker 3: of bird legs and the cooling benefits of eurohydrosis. But 453 00:27:00,280 --> 00:27:02,320 Speaker 3: this is yet to be fully explored. But the idea 454 00:27:02,320 --> 00:27:05,800 Speaker 3: here would be if this were the case, that it 455 00:27:05,920 --> 00:27:10,040 Speaker 3: helps you advertise mating fitness better, if like the correct 456 00:27:10,119 --> 00:27:13,399 Speaker 3: pigmentation on your legs is showing, and that by pooping 457 00:27:13,440 --> 00:27:15,679 Speaker 3: all over your legs, this like changes the way you 458 00:27:15,720 --> 00:27:19,479 Speaker 3: look and sort of downgrades your mating appeal. So there 459 00:27:19,480 --> 00:27:22,080 Speaker 3: could be some push and pull there, but that wasn't 460 00:27:22,520 --> 00:27:25,560 Speaker 3: very well established. But more briefly, I did want to 461 00:27:25,600 --> 00:27:28,359 Speaker 3: mention a second paper that involved three of the same 462 00:27:28,400 --> 00:27:31,760 Speaker 3: authors as the previous paper, because it had some interesting 463 00:27:31,800 --> 00:27:35,280 Speaker 3: follow up on this and involved a more direct method. 464 00:27:35,880 --> 00:27:38,639 Speaker 3: And so the second paper was by again three of 465 00:27:38,680 --> 00:27:44,600 Speaker 3: the same authors, Kubeovergel, Viegas and Gutierrez, and this one 466 00:27:44,640 --> 00:27:48,480 Speaker 3: was called Keeping Cool with Poop. Eurohydrosis lowers leg surface 467 00:27:48,520 --> 00:27:51,960 Speaker 3: temperature by up to six degrees celsius in breeding white storks, 468 00:27:52,280 --> 00:27:56,800 Speaker 3: published in Ecosphere in twenty twenty three. And this study 469 00:27:56,880 --> 00:27:59,679 Speaker 3: was a direct attempt to measure that the magnitude and 470 00:27:59,720 --> 00:28:02,960 Speaker 3: dear duration of the evaporative cooling that you get from 471 00:28:02,960 --> 00:28:08,639 Speaker 3: eurohydrosis in free ranging birds. The study used observations of 472 00:28:08,760 --> 00:28:14,080 Speaker 3: eurohydrosis in white storks or Seconias econia, paired with thermal 473 00:28:14,119 --> 00:28:18,160 Speaker 3: imaging and microclimate measurements to see like exactly how much 474 00:28:18,160 --> 00:28:21,800 Speaker 3: benefit the leg pooping was providing. Now, this next part 475 00:28:21,800 --> 00:28:24,920 Speaker 3: in the abstract did make me laugh. They write, quote, 476 00:28:25,320 --> 00:28:28,959 Speaker 3: we show that eurohydrosis can reduce leg surface temperature by 477 00:28:29,080 --> 00:28:32,719 Speaker 3: up to six point seven degrees celsius, which is actually 478 00:28:32,800 --> 00:28:35,960 Speaker 3: four point four plus or minus one point zero four 479 00:28:36,000 --> 00:28:40,520 Speaker 3: degrees celsius. Yet its cooling effect was of short duration, 480 00:28:40,760 --> 00:28:44,320 Speaker 3: lasting no more than two point five minutes and decreased 481 00:28:44,360 --> 00:28:48,280 Speaker 3: with time since defecation. Which actually that makes sense, right, 482 00:28:48,320 --> 00:28:50,960 Speaker 3: because like, if you're trying to work through evaporative cooling, 483 00:28:51,040 --> 00:28:53,400 Speaker 3: as the bird poops on its leg, it will be 484 00:28:53,880 --> 00:28:56,720 Speaker 3: very it will have a great cooling effect while the 485 00:28:56,760 --> 00:28:59,959 Speaker 3: poop is still very wet, but then as it evaporates, 486 00:29:00,480 --> 00:29:02,760 Speaker 3: it will dry up, and then it will provide less 487 00:29:02,800 --> 00:29:05,200 Speaker 3: of a cooling benefit and may even have some negative 488 00:29:05,240 --> 00:29:07,200 Speaker 3: effect in fact, if it like cakes on. 489 00:29:07,560 --> 00:29:10,840 Speaker 1: You know, let's keep all of this in mind as 490 00:29:10,840 --> 00:29:11,920 Speaker 1: we perceive, right. 491 00:29:12,720 --> 00:29:15,080 Speaker 3: So, but then there's the second second thing here. The 492 00:29:15,200 --> 00:29:19,880 Speaker 3: selection continues quote. Thus, for eurohydrosis to significantly contribute to 493 00:29:19,920 --> 00:29:25,840 Speaker 3: heat dissipation, storks must perform it repeatedly when overheated. So 494 00:29:25,920 --> 00:29:28,680 Speaker 3: the leg pooping must go on and on, and it 495 00:29:28,720 --> 00:29:31,680 Speaker 3: turns out it does. The authors found that the white 496 00:29:31,720 --> 00:29:35,360 Speaker 3: storks here can poop on themselves eleven times per hour. 497 00:29:36,000 --> 00:29:38,040 Speaker 3: And I did a little math there. So with like 498 00:29:38,120 --> 00:29:41,360 Speaker 3: two point five minutes of cooling with each blast, that's 499 00:29:41,480 --> 00:29:44,479 Speaker 3: twenty seven point five minutes of cooling per hour. If 500 00:29:44,520 --> 00:29:47,360 Speaker 3: they do it eleven times, almost half of the time 501 00:29:47,400 --> 00:29:50,400 Speaker 3: of the hour is in cooling. Mode. So the authors 502 00:29:50,520 --> 00:29:54,200 Speaker 3: estimate that eurohydrosis can cover quote four percent of the 503 00:29:54,280 --> 00:29:58,479 Speaker 3: daily field metabolic rate for an adult stork. Wow. 504 00:29:59,000 --> 00:30:02,240 Speaker 1: So it's like any like cooling system in a house 505 00:30:02,320 --> 00:30:04,240 Speaker 1: that might it might not be on all the time. 506 00:30:04,400 --> 00:30:07,440 Speaker 1: That would probably be just biologically impossible, but it's going 507 00:30:07,520 --> 00:30:10,160 Speaker 1: to keep coming on periodically to try and keep the 508 00:30:10,160 --> 00:30:11,120 Speaker 1: temperature down. 509 00:30:11,560 --> 00:30:15,440 Speaker 3: Yeah, that's a great comparison. It'll trigger repeatedly over time 510 00:30:15,800 --> 00:30:18,560 Speaker 3: to kick off little short periods of cooling, and then 511 00:30:18,560 --> 00:30:21,160 Speaker 3: the body temperature will come back up again, and then 512 00:30:21,200 --> 00:30:24,440 Speaker 3: the bird will release the excreta again and it will 513 00:30:24,520 --> 00:30:27,000 Speaker 3: set off another short period of cooling, and it'll go 514 00:30:27,080 --> 00:30:30,040 Speaker 3: back and forth. Now, I just did want to I 515 00:30:30,400 --> 00:30:32,200 Speaker 3: mentioned this on the earlier study, but I did want 516 00:30:32,200 --> 00:30:34,640 Speaker 3: to emphasize again. Unless you think, oh, you know, this 517 00:30:34,800 --> 00:30:38,480 Speaker 3: is just silly, this is actually interesting and relevant knowledge, 518 00:30:38,520 --> 00:30:42,680 Speaker 3: and will things like this will be of increasing importance 519 00:30:42,760 --> 00:30:47,640 Speaker 3: to wildlife and conservation biologists over time. The author's right quote. 520 00:30:47,680 --> 00:30:51,560 Speaker 3: Gaining knowledge about behavioral thermoregulation in the heat is therefore 521 00:30:51,560 --> 00:30:54,960 Speaker 3: crucial to better predict the future persistence and vulnerability of 522 00:30:55,000 --> 00:30:58,560 Speaker 3: species under different climate warming scenarios. A lot of these 523 00:30:58,600 --> 00:31:01,520 Speaker 3: species are going to be living in places where the 524 00:31:02,280 --> 00:31:05,680 Speaker 3: local climate is increasing in heat over time. That's increasing 525 00:31:05,720 --> 00:31:08,000 Speaker 3: the heat stress on animals that live in the wild, 526 00:31:08,480 --> 00:31:11,640 Speaker 3: and some animals will be better or worse able to 527 00:31:11,640 --> 00:31:24,400 Speaker 3: deal with it than others. There was another question that 528 00:31:24,440 --> 00:31:27,640 Speaker 3: came out because I saw some stuff online in discussions 529 00:31:27,680 --> 00:31:33,040 Speaker 3: about eurohidrosis that was about possible other functions. It seems 530 00:31:33,040 --> 00:31:37,280 Speaker 3: pretty clear that certainly in storks, it's playing a role 531 00:31:37,440 --> 00:31:41,480 Speaker 3: in cooling the body. But is eurohidrosis just to cool 532 00:31:41,520 --> 00:31:44,920 Speaker 3: the body or in some species, could it be playing 533 00:31:45,040 --> 00:31:48,000 Speaker 3: another role as well? Like I saw some ideas that 534 00:31:48,040 --> 00:31:50,640 Speaker 3: it could possibly have an antibacterial function. 535 00:31:51,320 --> 00:31:54,000 Speaker 1: Yeah, and that brings us back to the gross and 536 00:31:54,120 --> 00:31:59,040 Speaker 1: wonderful world of vultures. These splendid kings and queens who 537 00:31:59,440 --> 00:32:03,240 Speaker 1: keep our s it's clear of carcasses and in general 538 00:32:03,280 --> 00:32:06,520 Speaker 1: are just great decomposers there. There were a few in 539 00:32:06,560 --> 00:32:09,120 Speaker 1: our neighborhood not to just a week or so ago. 540 00:32:09,400 --> 00:32:12,640 Speaker 1: They were disrupting traffic. But you know, as we went 541 00:32:12,720 --> 00:32:15,000 Speaker 1: by them, we saluted them because they were they were 542 00:32:15,000 --> 00:32:16,400 Speaker 1: doing the lord's work out there. 543 00:32:16,640 --> 00:32:18,360 Speaker 3: They're worthy of our respect. Yes. 544 00:32:18,800 --> 00:32:22,280 Speaker 1: So, yeah, there's this idea that various New World vultures 545 00:32:22,680 --> 00:32:26,960 Speaker 1: are engaging in this kind of you know, possible euro hydrosis, 546 00:32:27,200 --> 00:32:31,400 Speaker 1: but maybe not for temperature control purposes. That you know, 547 00:32:31,440 --> 00:32:33,480 Speaker 1: they've been observed to do it when it's cold, they've 548 00:32:33,480 --> 00:32:35,640 Speaker 1: been observed to do it when it's warm, So what 549 00:32:35,800 --> 00:32:39,360 Speaker 1: could the purpose be. And there is this idea that 550 00:32:39,600 --> 00:32:42,560 Speaker 1: it is essentially kind of like when we reach for 551 00:32:43,040 --> 00:32:46,960 Speaker 1: a container of a hand sanitizer, except for the vulture whose, 552 00:32:46,960 --> 00:32:49,680 Speaker 1: of course, you know, it's it's getting its talons into 553 00:32:49,720 --> 00:32:54,080 Speaker 1: various you know, grotesque feasts there on the side of 554 00:32:54,120 --> 00:32:57,120 Speaker 1: the road or in the wilderness and so forth. Occasionally 555 00:32:57,440 --> 00:33:01,440 Speaker 1: it makes sense to to sam ties those legs with 556 00:33:01,520 --> 00:33:06,240 Speaker 1: an eye, perhaps with a nice you know, coloacal wash. 557 00:33:05,600 --> 00:33:08,959 Speaker 1: And so that is the theory that there is an 558 00:33:09,080 --> 00:33:13,840 Speaker 1: antiseptic nature of vulture defecation and that it, you know, 559 00:33:13,960 --> 00:33:17,680 Speaker 1: especially would be important for various scrapes and cuts on 560 00:33:17,720 --> 00:33:20,320 Speaker 1: those appendages. And so I was reading about this in 561 00:33:20,360 --> 00:33:22,800 Speaker 1: a twenty twenty two book, Vultures of the World, in 562 00:33:22,840 --> 00:33:26,520 Speaker 1: which the author Keith l builds and points out that 563 00:33:26,640 --> 00:33:30,680 Speaker 1: at the time, at any rate, the antiseptic nature of 564 00:33:30,720 --> 00:33:33,960 Speaker 1: vulture defication had not been like tested to the fullest. 565 00:33:34,040 --> 00:33:38,000 Speaker 1: So it's still kind of an open question, but this 566 00:33:38,080 --> 00:33:41,480 Speaker 1: does seem to be a strong argument, again based in 567 00:33:41,600 --> 00:33:43,200 Speaker 1: large part of the fact that they do seem to 568 00:33:43,200 --> 00:33:47,000 Speaker 1: do it both in summer and winter, suggesting that disinfection 569 00:33:47,160 --> 00:33:50,000 Speaker 1: might be at least an important part of the equation 570 00:33:50,200 --> 00:33:55,080 Speaker 1: for like turkey vultures. Okay, now, an interesting fact about this. 571 00:33:55,360 --> 00:33:57,200 Speaker 1: I was not familiar with this, but the author here 572 00:33:57,280 --> 00:34:00,960 Speaker 1: points out that in US, in US and Canada at 573 00:34:01,000 --> 00:34:05,200 Speaker 1: any rate, vulture researchers are prohibited from using leg bands 574 00:34:05,240 --> 00:34:08,720 Speaker 1: on turkey vultures because there's a risk of uric acid 575 00:34:08,760 --> 00:34:12,439 Speaker 1: building up and cementing around the leg band, because again 576 00:34:12,480 --> 00:34:15,640 Speaker 1: they're pooping and peeing down those legs. If you have 577 00:34:16,160 --> 00:34:19,920 Speaker 1: a band there for tracking purposes, it could you know, 578 00:34:20,000 --> 00:34:23,160 Speaker 1: it gets caught there, it drives there, it's cements there, 579 00:34:24,200 --> 00:34:27,920 Speaker 1: and this could effectively hobble the bird over time. Eventually 580 00:34:27,960 --> 00:34:30,120 Speaker 1: it's like too big of a weight for them to 581 00:34:30,160 --> 00:34:32,920 Speaker 1: fly off with apparently, or at least you know, it 582 00:34:32,920 --> 00:34:34,759 Speaker 1: would get in the way of their they're flying, in 583 00:34:34,800 --> 00:34:39,520 Speaker 1: their ability to carry out their daily activities. So fortunately, 584 00:34:39,600 --> 00:34:42,279 Speaker 1: there are other methods for tracking them, things like wing 585 00:34:42,400 --> 00:34:45,480 Speaker 1: tags and the like. But putting a leg tag on 586 00:34:45,560 --> 00:34:48,360 Speaker 1: them as a no no. Now, before we get away 587 00:34:48,440 --> 00:34:51,640 Speaker 1: from birds, I do want to point out that in looking, 588 00:34:51,760 --> 00:34:53,600 Speaker 1: I'm always interested to see if there's any kind of 589 00:34:54,440 --> 00:34:58,040 Speaker 1: mythological or folklooric tie in to a particular topic, And 590 00:34:58,080 --> 00:35:02,240 Speaker 1: I really wasn't expecting much here, but I did find 591 00:35:02,480 --> 00:35:07,680 Speaker 1: mention of this in connection to Amazonian mythology via a 592 00:35:07,719 --> 00:35:11,080 Speaker 1: book titled an Amazonian myth and its History by Peter 593 00:35:11,239 --> 00:35:13,839 Speaker 1: Goal that came out in two thousand and one. So 594 00:35:14,280 --> 00:35:18,799 Speaker 1: the story involved here is referred to as the Sun, 595 00:35:19,320 --> 00:35:23,520 Speaker 1: and it entails a character who is at one point eviscerated, 596 00:35:24,440 --> 00:35:26,680 Speaker 1: but in a nice way, like in a like a 597 00:35:26,680 --> 00:35:32,440 Speaker 1: polite mythic way, like he's asleep, and the creatures that 598 00:35:32,440 --> 00:35:35,880 Speaker 1: are working for him like remove his intestines. But at 599 00:35:35,880 --> 00:35:40,360 Speaker 1: any rate, the story involves a character who's eviscerated becomes gutless, 600 00:35:40,760 --> 00:35:44,640 Speaker 1: and by becoming gutless, can now eat and drink all 601 00:35:44,680 --> 00:35:48,560 Speaker 1: he wants, but can also never be satisfied. And this 602 00:35:48,640 --> 00:35:51,520 Speaker 1: is a story that Gal says is apparently connected to 603 00:35:51,640 --> 00:35:56,319 Speaker 1: observations of the wood stork who appeared gutless because they 604 00:35:56,320 --> 00:36:00,719 Speaker 1: are constantly excreting waste. You mentioned like how often per 605 00:36:00,800 --> 00:36:04,319 Speaker 1: hour they are excreting in order to cool those legs down, 606 00:36:04,719 --> 00:36:06,680 Speaker 1: and it can lead to this observation it's like, well, 607 00:36:06,680 --> 00:36:10,480 Speaker 1: this animal poops all the time, and we don't do that, 608 00:36:10,600 --> 00:36:12,839 Speaker 1: like we you know, we know exactly, we know more 609 00:36:12,920 --> 00:36:15,040 Speaker 1: or less what's happening when we consume food and it 610 00:36:15,080 --> 00:36:18,520 Speaker 1: becomes nourishment and so forth. Perhaps the stork is not 611 00:36:18,680 --> 00:36:22,560 Speaker 1: giving it time at all, is just going straight through. 612 00:36:22,719 --> 00:36:25,839 Speaker 1: And therefore, you know, there's just these kind of you know, 613 00:36:26,200 --> 00:36:28,720 Speaker 1: ravenous but unsatisfied creatures. 614 00:36:28,719 --> 00:36:31,640 Speaker 3: Interesting. Now, I didn't come across a poop count on 615 00:36:31,760 --> 00:36:34,319 Speaker 3: the wood stork, but in that one study, yet there 616 00:36:34,480 --> 00:36:36,560 Speaker 3: was the white stork, and it was up to eleven 617 00:36:36,640 --> 00:36:39,240 Speaker 3: times per hour. Wow, that's a lot. 618 00:36:39,920 --> 00:36:43,719 Speaker 1: So the myth, as recounted, apparently involves a man who 619 00:36:43,880 --> 00:36:47,480 Speaker 1: has enslaved the wood storks to do his bidding, but 620 00:36:47,560 --> 00:36:50,879 Speaker 1: then while he's asleep in the canoe, they remove his intestines, 621 00:36:51,120 --> 00:36:54,319 Speaker 1: and they intestines and they like hang them over the 622 00:36:54,320 --> 00:36:57,719 Speaker 1: side of the canoe, and when he wakes up, he's like, hey, 623 00:36:57,719 --> 00:37:00,839 Speaker 1: what's this stuff here? They have carently don't say anything, 624 00:37:00,920 --> 00:37:02,880 Speaker 1: so he throws it out and then the storks tell 625 00:37:02,920 --> 00:37:04,799 Speaker 1: him later they're like, oh, yeah, by the way, those 626 00:37:04,800 --> 00:37:09,719 Speaker 1: we are intestines. So as I understand that what we 627 00:37:09,920 --> 00:37:12,719 Speaker 1: have here is we have an observation of nature, an 628 00:37:12,719 --> 00:37:16,040 Speaker 1: incorrect hypothesis or a very loose hypothesis that may be 629 00:37:16,080 --> 00:37:20,279 Speaker 1: concerned more with the mythic purposes of the tail as 630 00:37:20,280 --> 00:37:24,400 Speaker 1: opposed to anything else. And then this bleeds into an 631 00:37:24,440 --> 00:37:28,800 Speaker 1: anatomical mythology that presents something almost like a hungry ghost, 632 00:37:28,960 --> 00:37:32,600 Speaker 1: you know, this idea of a being that cannot be 633 00:37:32,680 --> 00:37:40,680 Speaker 1: satisfied because his digestive capabilities are just not intact, and 634 00:37:40,760 --> 00:37:42,759 Speaker 1: that perhaps that's what we see when we see these 635 00:37:42,800 --> 00:37:43,760 Speaker 1: storks as well. 636 00:37:44,120 --> 00:37:46,000 Speaker 3: Interesting. I mean, I guess that does sort of tie 637 00:37:46,040 --> 00:37:48,920 Speaker 3: into the observation that the storks most likely to engage 638 00:37:48,920 --> 00:37:50,319 Speaker 3: in this are the ones that are going to be 639 00:37:51,040 --> 00:37:54,440 Speaker 3: out in the sun on dry land in the heat, 640 00:37:54,560 --> 00:37:58,280 Speaker 3: but also birds that have ready access to drinking water, 641 00:37:58,680 --> 00:38:01,120 Speaker 3: and that this would probably not be a good adaptation 642 00:38:01,320 --> 00:38:04,360 Speaker 3: for a bird species that had to, you know, that 643 00:38:04,480 --> 00:38:07,960 Speaker 3: had to conserve water resources maximally and did not have 644 00:38:08,040 --> 00:38:10,200 Speaker 3: ready access to water bodies. Yeah. 645 00:38:10,360 --> 00:38:13,719 Speaker 1: Yeah, I didn't have enough time to really dive into 646 00:38:13,760 --> 00:38:16,919 Speaker 1: this text, but it's out there. If anyone else wants 647 00:38:16,960 --> 00:38:18,799 Speaker 1: to look into it again. The author is Peter gow 648 00:38:19,160 --> 00:38:21,359 Speaker 1: who lived nineteen fifty eight through twenty twenty one. He 649 00:38:21,400 --> 00:38:24,759 Speaker 1: was a social anthropologist who worked a lot in the Amazon. 650 00:38:26,040 --> 00:38:29,600 Speaker 3: Interesting story, Yeah, yeah, I also was. I did not 651 00:38:29,719 --> 00:38:32,279 Speaker 3: think there would be a eurohydrosis related myth. 652 00:38:33,520 --> 00:38:38,000 Speaker 1: Oh, but here we are. Let's see other animals. Though, 653 00:38:38,880 --> 00:38:42,800 Speaker 1: interestingly enough, we also see this in some aquatic mammals. 654 00:38:44,000 --> 00:38:46,440 Speaker 1: The main example that I was reading about in a 655 00:38:46,640 --> 00:38:49,200 Speaker 1: paper that you sent to me, Joe, is the southern 656 00:38:49,320 --> 00:38:54,959 Speaker 1: fur seal or arctocephalus. This is this means bare head 657 00:38:55,120 --> 00:38:58,200 Speaker 1: because we're talking about Antarctic fur seals here. These are 658 00:38:58,920 --> 00:39:03,920 Speaker 1: furry looking critters adapted to thrive in very cold waters. However, 659 00:39:04,000 --> 00:39:07,440 Speaker 1: as Roger L. Gentry discusses in the nineteen seventy three 660 00:39:07,560 --> 00:39:12,040 Speaker 1: paper thermo Regulatory Behavior of Eared Seals, this published in 661 00:39:12,080 --> 00:39:16,160 Speaker 1: the journal Behavior, they have other means of thermoregulation that 662 00:39:16,239 --> 00:39:20,120 Speaker 1: become necessary when these well insulated creatures are out of 663 00:39:20,120 --> 00:39:23,600 Speaker 1: the water and caring about on the shore, on the 664 00:39:23,680 --> 00:39:24,960 Speaker 1: rocks in the sun. 665 00:39:25,840 --> 00:39:28,919 Speaker 3: Ah Okay, so this might be a different situation than 666 00:39:29,320 --> 00:39:31,960 Speaker 3: the storks living in like a really hot climate under 667 00:39:31,960 --> 00:39:33,480 Speaker 3: the direct sun. I mean, I guess you could still 668 00:39:33,520 --> 00:39:35,360 Speaker 3: have the sun beating down on you. But the issue 669 00:39:35,360 --> 00:39:38,719 Speaker 3: here would be that the seals are very well adapted 670 00:39:38,719 --> 00:39:41,839 Speaker 3: to the cold, and so in cases where they're under 671 00:39:41,880 --> 00:39:45,600 Speaker 3: the sun and it's not very cold, their heat conserving 672 00:39:45,640 --> 00:39:47,600 Speaker 3: adaptations are working against them. 673 00:39:48,120 --> 00:39:51,360 Speaker 1: Right And the situation where this becomes essential, especially for 674 00:39:51,400 --> 00:39:55,320 Speaker 1: the males, it has to do with their breeding period, 675 00:39:56,239 --> 00:39:59,319 Speaker 1: because they live a lot of their lives in the water, 676 00:39:59,400 --> 00:40:02,640 Speaker 1: but they they come on to land, you know, during 677 00:40:02,640 --> 00:40:05,480 Speaker 1: the breeding period, and it's very important for a male 678 00:40:05,680 --> 00:40:08,920 Speaker 1: to hold down his territory. So there's a lot of 679 00:40:09,200 --> 00:40:13,680 Speaker 1: fighting and squabbling for territory and for females, and it's 680 00:40:13,719 --> 00:40:15,520 Speaker 1: a it can be a real endurance game for the 681 00:40:15,600 --> 00:40:19,960 Speaker 1: males of you know, various seal species species because they're 682 00:40:19,960 --> 00:40:23,440 Speaker 1: having to constantly fight and at the same time they 683 00:40:23,480 --> 00:40:27,200 Speaker 1: have to maintain acceptable body temperatures, they have to thermoregulate, 684 00:40:28,320 --> 00:40:30,440 Speaker 1: and they're not in the water at this point. The 685 00:40:30,480 --> 00:40:34,279 Speaker 1: water is the author points out, the ideal place for 686 00:40:34,480 --> 00:40:38,680 Speaker 1: this creature to cool down. But you're fighting a territory war, 687 00:40:39,480 --> 00:40:42,560 Speaker 1: in a mating war up here on the rocks. So 688 00:40:43,400 --> 00:40:45,600 Speaker 1: getting back in the water is something you can do, 689 00:40:45,800 --> 00:40:49,200 Speaker 1: but that is going to be like your last resort 690 00:40:49,600 --> 00:40:52,360 Speaker 1: because you're giving up territory at that point, so you 691 00:40:52,440 --> 00:40:56,680 Speaker 1: have to do other things. So Jenry discusses how, especially 692 00:40:57,040 --> 00:41:00,040 Speaker 1: during the high temperatures in these environments, you'll see a 693 00:41:00,040 --> 00:41:03,040 Speaker 1: few different behaviors. So on one hand, they will seek 694 00:41:03,080 --> 00:41:06,839 Speaker 1: out shade or shade cooled rocks, which you know, kind 695 00:41:06,840 --> 00:41:08,960 Speaker 1: of the same thing. But it's essential to note that 696 00:41:09,680 --> 00:41:12,120 Speaker 1: rocks of course heat up in the sun, so being 697 00:41:12,160 --> 00:41:15,120 Speaker 1: in the shade is one level of protection, but also 698 00:41:15,480 --> 00:41:17,880 Speaker 1: being on rocks that are either currently or have just 699 00:41:17,960 --> 00:41:21,640 Speaker 1: previously been cooled by the shade is also worth thinking about. 700 00:41:23,200 --> 00:41:27,240 Speaker 1: And so according to Gentry, during higher temperatures, these seals 701 00:41:27,239 --> 00:41:30,200 Speaker 1: have been observed to stand on all fours and then 702 00:41:30,320 --> 00:41:35,280 Speaker 1: annoy their flippers and bellies with urine, with the back 703 00:41:35,480 --> 00:41:38,600 Speaker 1: of flippers being the key, because then they'll lay on 704 00:41:38,600 --> 00:41:42,200 Speaker 1: one side and extend their now wet rear flipper into 705 00:41:42,280 --> 00:41:45,200 Speaker 1: the air, and this will be the way they carry 706 00:41:45,680 --> 00:41:49,480 Speaker 1: carry out some evaporative cooling. He also notes that the 707 00:41:49,520 --> 00:41:52,799 Speaker 1: males seemingly drink more water in the surf during this 708 00:41:52,920 --> 00:41:56,920 Speaker 1: time period in order to provide more urine for thermoregulation 709 00:41:57,360 --> 00:41:59,319 Speaker 1: when they're out on the shore. So, coming back to 710 00:41:59,320 --> 00:42:01,600 Speaker 1: what we were talking about with the with the storks, 711 00:42:02,040 --> 00:42:04,359 Speaker 1: if you're going to engage in something like this, you've 712 00:42:04,400 --> 00:42:06,720 Speaker 1: got to keep you got to keep the fluids flowing. 713 00:42:07,440 --> 00:42:09,960 Speaker 3: That is so interesting imagining like the sort of the 714 00:42:10,040 --> 00:42:13,200 Speaker 3: chain of preparations there I'm thinking about, So the male 715 00:42:13,239 --> 00:42:16,200 Speaker 3: seals like tanking up with water to get ready for 716 00:42:16,320 --> 00:42:19,520 Speaker 3: one of these one of these like breeding season things 717 00:42:19,520 --> 00:42:21,279 Speaker 3: where he knows he's going to be out under the sun. 718 00:42:21,920 --> 00:42:23,600 Speaker 1: Now, this is also interesting to think about for me 719 00:42:23,680 --> 00:42:28,200 Speaker 1: because I did get to see Galapago's fur seals carrying 720 00:42:28,600 --> 00:42:31,520 Speaker 1: out carrying out their their various activities on the beach 721 00:42:32,000 --> 00:42:34,600 Speaker 1: when I was down at the Galapagos Islands, and I 722 00:42:35,200 --> 00:42:37,120 Speaker 1: didn't even know to look out for any kind of 723 00:42:37,239 --> 00:42:38,560 Speaker 1: urination going on. 724 00:42:38,760 --> 00:42:38,960 Speaker 3: I did. 725 00:42:39,000 --> 00:42:42,600 Speaker 1: I don't think I saw any like actual throwdowns between 726 00:42:42,880 --> 00:42:46,360 Speaker 1: male seals, but I did get to see like some 727 00:42:46,520 --> 00:42:50,200 Speaker 1: of what they're up to. So yeah, I wish i'd 728 00:42:50,200 --> 00:42:51,040 Speaker 1: known to look out for this. 729 00:42:51,440 --> 00:42:53,000 Speaker 3: What does it look what does it look like some 730 00:42:53,080 --> 00:42:55,279 Speaker 3: we're just trying to like stake out good territory. 731 00:42:55,920 --> 00:42:58,959 Speaker 1: Yeah, you'll see like a big male and a bunch 732 00:42:58,960 --> 00:43:02,560 Speaker 1: of females and then you know, basically trying to hold 733 00:43:02,600 --> 00:43:04,680 Speaker 1: down the territory of this part of the beach with 734 00:43:04,800 --> 00:43:08,480 Speaker 1: these females. And then occasionally here's some other male seal 735 00:43:08,560 --> 00:43:12,080 Speaker 1: coming that is going to contest this situation, and then 736 00:43:12,200 --> 00:43:14,640 Speaker 1: you know, there are various little squabbles about where the 737 00:43:15,120 --> 00:43:18,080 Speaker 1: females are getting to lay about as well. And then 738 00:43:18,160 --> 00:43:21,440 Speaker 1: you know, sometimes and then this is also inevitably happening 739 00:43:21,640 --> 00:43:23,560 Speaker 1: or a lot of the time, it's happening on beaches 740 00:43:23,880 --> 00:43:26,480 Speaker 1: that where people are also hanging around, so they're also 741 00:43:26,560 --> 00:43:31,680 Speaker 1: human tourists, so there's a lot of and of course 742 00:43:31,680 --> 00:43:33,560 Speaker 1: when the seals decide they want to go somewhere, it's 743 00:43:33,560 --> 00:43:35,520 Speaker 1: like it's time for the humans to move. 744 00:43:36,320 --> 00:43:37,920 Speaker 3: Don't mess with seals, folks. 745 00:43:37,760 --> 00:43:40,359 Speaker 1: Yeah, but sometimes they could be a little like at 746 00:43:40,360 --> 00:43:43,280 Speaker 1: one point, I was just sitting there with my family 747 00:43:43,320 --> 00:43:45,960 Speaker 1: and there was like a smaller, very loud female seal 748 00:43:46,400 --> 00:43:48,840 Speaker 1: and she just decided she needed to set where I was, 749 00:43:48,880 --> 00:43:51,080 Speaker 1: So of course I moved and then she sat there 750 00:43:51,120 --> 00:43:53,440 Speaker 1: for a little bit and kind of you know, catterwaulled 751 00:43:53,480 --> 00:43:55,799 Speaker 1: a bit, and then she moved on elsewhere. But it 752 00:43:55,840 --> 00:43:57,880 Speaker 1: was like I don't know. It kind of felt like 753 00:43:57,880 --> 00:44:01,400 Speaker 1: she was being a little petty, but this beach belongs 754 00:44:01,400 --> 00:44:06,960 Speaker 1: to you. I'm just visiting, very magnanimous. Yes, hey, just 755 00:44:07,000 --> 00:44:10,400 Speaker 1: a quick post publication note. I want to insert here 756 00:44:11,560 --> 00:44:15,680 Speaker 1: Everything that I was saying about the fur seals is 757 00:44:16,200 --> 00:44:18,640 Speaker 1: correct according to my research. But in the heat of 758 00:44:18,640 --> 00:44:23,640 Speaker 1: the moment, I mentioned the Galapagos, and I mistook my 759 00:44:23,840 --> 00:44:29,160 Speaker 1: memory of Galapagos Sea lions for Galapago's fur seals. So 760 00:44:29,880 --> 00:44:32,960 Speaker 1: sorry about that. My apologies, but I did want to 761 00:44:33,000 --> 00:44:37,120 Speaker 1: throw in this post publication correction here for anyone who 762 00:44:37,160 --> 00:44:41,000 Speaker 1: listens to the episode later. Yeah, I didn't have anything 763 00:44:41,000 --> 00:44:43,440 Speaker 1: about the Galapagos in my notes. It's just as I 764 00:44:43,480 --> 00:44:46,400 Speaker 1: was going through this part of the episode, it stirred 765 00:44:46,400 --> 00:44:49,480 Speaker 1: a memory, and as is sometimes the case with memories 766 00:44:49,480 --> 00:44:52,359 Speaker 1: that are recalled from the depths, sometimes it comes up 767 00:44:52,440 --> 00:44:55,719 Speaker 1: with a little bit of incorrect information applied there. So, 768 00:44:55,880 --> 00:45:00,879 Speaker 1: without further ado, let's get back into the episode. Now, 769 00:45:01,760 --> 00:45:05,399 Speaker 1: speaking of the Galapagos, this does bring me to the 770 00:45:05,480 --> 00:45:07,640 Speaker 1: next question that I had, because when I was in 771 00:45:07,680 --> 00:45:11,400 Speaker 1: the Glapagos, I did just a little bit of snorkeling 772 00:45:11,880 --> 00:45:14,160 Speaker 1: in very cold waters, and I was wearing a dive 773 00:45:14,160 --> 00:45:19,080 Speaker 1: suit because it gets cold. And if you've ever gone 774 00:45:19,160 --> 00:45:23,600 Speaker 1: diving or done scuba diving or snorkeling and you've worn 775 00:45:23,680 --> 00:45:26,719 Speaker 1: a wet suit and the water's been cold, you might 776 00:45:26,760 --> 00:45:28,440 Speaker 1: have done what a lot of people have done what 777 00:45:28,480 --> 00:45:30,480 Speaker 1: I did as well, and that is urinate in the 778 00:45:30,520 --> 00:45:34,000 Speaker 1: suit while you're in the water to warm things up 779 00:45:34,000 --> 00:45:38,120 Speaker 1: a bit. This instantly came to my mind when we 780 00:45:38,120 --> 00:45:40,319 Speaker 1: started getting into this, because, yeah, like this seems like 781 00:45:40,360 --> 00:45:43,359 Speaker 1: an example where humans can get in on the euro 782 00:45:43,480 --> 00:45:47,360 Speaker 1: hydrosis action, right, sort of in the opposite direction, in 783 00:45:47,360 --> 00:45:52,520 Speaker 1: the opposite direction, right, you know, can we just pee 784 00:45:52,640 --> 00:45:55,960 Speaker 1: in our dive suits in order to warm things up? 785 00:45:56,520 --> 00:45:57,879 Speaker 1: And you know, I was able to find a full 786 00:45:58,000 --> 00:46:01,400 Speaker 1: article about this on dive si dot com. That's Scuba 787 00:46:01,440 --> 00:46:02,600 Speaker 1: School's International. 788 00:46:04,280 --> 00:46:07,040 Speaker 3: That's beautiful. Well what's the word? All right? 789 00:46:07,080 --> 00:46:09,759 Speaker 1: So yeah, I didn't know what the what the full 790 00:46:09,800 --> 00:46:12,000 Speaker 1: scoop on this was. And I'm not like a big 791 00:46:12,280 --> 00:46:14,400 Speaker 1: I'm not a scuba diver and i am not a 792 00:46:14,400 --> 00:46:16,320 Speaker 1: wetsuit person, so I didn't even know what the accepted 793 00:46:16,320 --> 00:46:19,560 Speaker 1: wisdom was here. But the authors of this article point 794 00:46:19,600 --> 00:46:21,880 Speaker 1: out that, yeah, this is kind of like common lore 795 00:46:22,360 --> 00:46:27,200 Speaker 1: among divers and historically to scuba divers that that if 796 00:46:27,239 --> 00:46:28,520 Speaker 1: you get in a little cold, will pee in your 797 00:46:28,560 --> 00:46:30,799 Speaker 1: suit and then'll warm things up a bit. And they 798 00:46:30,840 --> 00:46:35,799 Speaker 1: point out that due to the mammalian dive response you 799 00:46:35,880 --> 00:46:38,880 Speaker 1: might need, you might have a heightened need to urinate 800 00:46:38,960 --> 00:46:41,600 Speaker 1: in this environment because a submerged mammal is going to 801 00:46:41,640 --> 00:46:45,480 Speaker 1: experience a slowed heart rate during free diving, especially, it's 802 00:46:45,480 --> 00:46:48,080 Speaker 1: going to narrow blood vessels and the extremities, and blood's 803 00:46:48,080 --> 00:46:49,760 Speaker 1: going to shift to the core parts of the body, 804 00:46:50,280 --> 00:46:53,120 Speaker 1: all in order to conserve oxygen and maintain blood flow 805 00:46:53,560 --> 00:46:57,520 Speaker 1: while holding one's breath. But more blood ends up going 806 00:46:57,520 --> 00:46:59,880 Speaker 1: to the core and then via the kidneys. This increase 807 00:47:00,160 --> 00:47:02,319 Speaker 1: the urge to urinate. So you might find yourself in 808 00:47:02,320 --> 00:47:05,399 Speaker 1: a situation where you're like, Wow, I just got into 809 00:47:05,440 --> 00:47:08,560 Speaker 1: the water off the boat, it's cold, I need a 810 00:47:08,560 --> 00:47:11,160 Speaker 1: pee anyway, Why don't we warm things up a bit? 811 00:47:12,480 --> 00:47:14,560 Speaker 1: And so yeah, they point out that this is a 812 00:47:14,600 --> 00:47:17,360 Speaker 1: common bit of diver's lore, and the article states quote 813 00:47:17,600 --> 00:47:20,320 Speaker 1: the wet suit itself works by trapping a thin layer 814 00:47:20,360 --> 00:47:24,839 Speaker 1: of water between the neoprene that's a synthetic rubber and 815 00:47:24,880 --> 00:47:28,640 Speaker 1: the skin, which the body warms. This layer serves as insulation, 816 00:47:28,840 --> 00:47:31,479 Speaker 1: keeping the diver warm in cold water. When a diver 817 00:47:31,680 --> 00:47:34,640 Speaker 1: urinates in their wet suit, the initial warm sensation comes 818 00:47:34,640 --> 00:47:37,880 Speaker 1: from the body warmed urine. However, this effect is fleeting. 819 00:47:39,719 --> 00:47:41,600 Speaker 3: Nothing gold can stay. 820 00:47:41,719 --> 00:47:43,359 Speaker 1: I mean in this we do kind of come back 821 00:47:43,360 --> 00:47:46,359 Speaker 1: to the situation with the storks, right, I mean that too, 822 00:47:46,520 --> 00:47:49,759 Speaker 1: is fleeting. Is a cooling burst that will have to 823 00:47:49,800 --> 00:47:53,319 Speaker 1: be reapplied. I think the problem with divers is that 824 00:47:53,360 --> 00:47:56,399 Speaker 1: you probably don't have that many goes at it here, right, 825 00:47:56,480 --> 00:47:59,920 Speaker 1: you probably? Oh? I mean, how many times can we 826 00:48:00,200 --> 00:48:04,000 Speaker 1: you urinate in your suit on a given dive or snorkel. 827 00:48:05,239 --> 00:48:07,800 Speaker 1: I could be wrong, but I have a feeling knowing 828 00:48:07,840 --> 00:48:11,360 Speaker 1: my body that truly it's just one, maybe two, but 829 00:48:11,640 --> 00:48:14,479 Speaker 1: not enough to not not eleven times per hour. 830 00:48:15,040 --> 00:48:19,840 Speaker 3: Yeah, And if I'm understanding the dynamics here correctly, it 831 00:48:19,920 --> 00:48:23,360 Speaker 3: even then, like it's still just a sensation of warming. 832 00:48:23,400 --> 00:48:26,759 Speaker 3: Your body is not actually getting warmer from this, Like 833 00:48:26,840 --> 00:48:30,560 Speaker 3: you're you're losing warmth by peeing, But it's it feels 834 00:48:30,600 --> 00:48:32,200 Speaker 3: warm on the outside. 835 00:48:32,000 --> 00:48:35,399 Speaker 1: Right, You're gonna get that. And I can testify to this. Yeah, 836 00:48:35,440 --> 00:48:39,360 Speaker 1: you get you get a warming sensation, but it is fleeting, 837 00:48:39,480 --> 00:48:42,480 Speaker 1: they point out, because the urine quickly cools and things 838 00:48:42,520 --> 00:48:46,480 Speaker 1: that will then actually feel colder when this cooling occurs. 839 00:48:46,760 --> 00:48:48,160 Speaker 1: You know, it's it's kind of like when you first 840 00:48:48,160 --> 00:48:50,360 Speaker 1: get into the cold water to swim about. It's like 841 00:48:50,400 --> 00:48:52,160 Speaker 1: it can be shocking, takes your breath away, but then 842 00:48:52,160 --> 00:48:55,680 Speaker 1: you get used to it and you carry on. When 843 00:48:55,719 --> 00:48:58,239 Speaker 1: you when you pee your suit in order to warm up, 844 00:48:58,320 --> 00:49:01,200 Speaker 1: you kind of like recreate something like that scenario again. 845 00:49:01,239 --> 00:49:03,480 Speaker 1: We're like, oh, now now it's cold again. Because and 846 00:49:03,520 --> 00:49:05,840 Speaker 1: part of this is the wet suit is not waterproof, 847 00:49:05,880 --> 00:49:09,200 Speaker 1: it's permeable, so outside cold water will directly cool the 848 00:49:09,280 --> 00:49:13,200 Speaker 1: layer of spreading warm urine in the suit. Now, all 849 00:49:13,280 --> 00:49:15,640 Speaker 1: that being said, the article stresses that ping in your 850 00:49:15,680 --> 00:49:18,319 Speaker 1: wet suit is a common practice, and it is it's 851 00:49:18,400 --> 00:49:21,400 Speaker 1: not harmful. You know, you may have some hygienic or 852 00:49:21,440 --> 00:49:25,600 Speaker 1: some comfort concerns about it, but basically all they really 853 00:49:25,680 --> 00:49:28,320 Speaker 1: advise on this is, look, if you do it, fine, 854 00:49:28,360 --> 00:49:30,040 Speaker 1: but just you want to make sure you wash out 855 00:49:30,040 --> 00:49:31,799 Speaker 1: your suit afterwards. I mean, you're going to be washing 856 00:49:31,800 --> 00:49:34,640 Speaker 1: your suit out, but you know, if if you don't 857 00:49:34,840 --> 00:49:38,600 Speaker 1: thoroughly wash it out, you could get some some some 858 00:49:38,600 --> 00:49:42,800 Speaker 1: some urine odors, you know, in the material and so forth. 859 00:49:42,840 --> 00:49:46,200 Speaker 1: But and then again they stress that, yeah, you're gonna 860 00:49:46,200 --> 00:49:49,640 Speaker 1: get a warm burst, but it's not going to be lasting. 861 00:49:49,680 --> 00:49:51,839 Speaker 1: It's not. It's just just going to be a burst. 862 00:49:51,960 --> 00:49:53,440 Speaker 3: You know, correct me if I'm wrong. But I bet 863 00:49:53,480 --> 00:49:55,640 Speaker 3: a lot of people don't own their own dive suits 864 00:49:55,680 --> 00:49:57,560 Speaker 3: to your kind of is it a rental situation? 865 00:49:58,200 --> 00:50:00,440 Speaker 1: Yeah, yeah, I mean now that you mentioned it, like 866 00:50:00,600 --> 00:50:04,400 Speaker 1: the dive suit I urinated in was definitely not mine. 867 00:50:04,640 --> 00:50:08,800 Speaker 1: No shape was provided for me. And uh yeah, I 868 00:50:09,800 --> 00:50:13,080 Speaker 1: trust that they sprayed it out afterwards, I guess, so 869 00:50:13,400 --> 00:50:16,040 Speaker 1: it didn't seem gross when I put it on. So 870 00:50:16,640 --> 00:50:18,399 Speaker 1: uh And I imagine a lot of people have peede 871 00:50:18,440 --> 00:50:18,960 Speaker 1: in that suit. 872 00:50:19,200 --> 00:50:21,239 Speaker 3: Sound like everybody does it. I'm sure they wash them 873 00:50:21,239 --> 00:50:21,680 Speaker 3: real good. 874 00:50:22,040 --> 00:50:24,240 Speaker 1: I would love to hear from folks out there who've 875 00:50:24,239 --> 00:50:28,759 Speaker 1: done like a lot of like scuba and snorkeling in 876 00:50:28,840 --> 00:50:33,880 Speaker 1: wet suits. And you can add your own, you know, 877 00:50:34,000 --> 00:50:35,600 Speaker 1: two cents to this whole discussion. 878 00:50:36,040 --> 00:50:38,600 Speaker 3: Well, Rob, this topic went places I did not expect, 879 00:50:38,600 --> 00:50:40,560 Speaker 3: but I have I have found great delight in the 880 00:50:40,600 --> 00:50:41,719 Speaker 3: twists and turns. 881 00:50:42,200 --> 00:50:46,480 Speaker 1: Yeah yeah, yeah, As is often the case, once you 882 00:50:46,560 --> 00:50:48,200 Speaker 1: really get into a topic. You don't know where it's 883 00:50:48,239 --> 00:50:48,759 Speaker 1: going to take you. 884 00:50:49,239 --> 00:50:53,520 Speaker 3: Hey, but if you're somebody who happens to see storks, vultures, condors, ganets, 885 00:50:53,520 --> 00:50:56,880 Speaker 3: boobies in the wild, uh, and you catch them with 886 00:50:56,880 --> 00:50:59,440 Speaker 3: with like seeing this taking place, let us know. Do 887 00:50:59,440 --> 00:51:01,000 Speaker 3: you have any picture what's going on? 888 00:51:01,560 --> 00:51:05,439 Speaker 1: Yeah, that's right. We want natural world observations as well 889 00:51:05,440 --> 00:51:07,520 Speaker 1: as reports on adventures and paying yourself. 890 00:51:08,600 --> 00:51:11,319 Speaker 3: Please no pictures of human just the. 891 00:51:11,280 --> 00:51:16,839 Speaker 1: Birds, just the birds please, or the scenes. Yeah all right, 892 00:51:16,880 --> 00:51:18,720 Speaker 1: Well we're going to go and close out this episode, 893 00:51:18,760 --> 00:51:20,879 Speaker 1: but we'll remind you that Stuff to Blow Your Mind 894 00:51:20,920 --> 00:51:23,480 Speaker 1: is primarily a science and culture podcast, with core episodes 895 00:51:23,480 --> 00:51:26,760 Speaker 1: on Tuesdays and Thursdays and on Fridays. We set aside 896 00:51:27,400 --> 00:51:29,640 Speaker 1: most serious concerns to just talk about a weird film 897 00:51:29,680 --> 00:51:31,440 Speaker 1: on weird House Cinema, so you can always look out 898 00:51:31,440 --> 00:51:33,840 Speaker 1: for those episodes. You can find us on Instagram. We 899 00:51:33,880 --> 00:51:35,600 Speaker 1: are STBYM podcast. 900 00:51:35,880 --> 00:51:39,280 Speaker 3: There huge things as always to our excellent audio producer 901 00:51:39,400 --> 00:51:41,759 Speaker 3: JJ Posway. If you would like to get in touch 902 00:51:41,800 --> 00:51:43,759 Speaker 3: with us with feedback on this episode or any other, 903 00:51:43,880 --> 00:51:46,040 Speaker 3: to suggest a topic for the future, or just to 904 00:51:46,040 --> 00:51:49,200 Speaker 3: say hello, you can email us at contact at Stuff 905 00:51:49,200 --> 00:51:57,400 Speaker 3: to Blow Your Mind dot com. 906 00:51:50,920 --> 00:52:00,479 Speaker 2: Stuff to Blow Your Mind is production of iHeart Radio. 907 00:52:00,800 --> 00:52:03,760 Speaker 2: For more podcasts from iHeart Radio, visit the iHeartRadio app, 908 00:52:03,920 --> 00:52:19,360 Speaker 2: Apple Podcasts, or wherever you're listening to your favorite shows.