WEBVTT - From the Vault: The Manta Ray, Part 1

0:00:06.200 --> 0:00:09.840
<v Speaker 1>Hey, you welcome to Stuff to Blow your Mind. My

0:00:10.080 --> 0:00:13.960
<v Speaker 1>name is Robert Lamb. Today is Saturday, so we have

0:00:14.000 --> 0:00:15.840
<v Speaker 1>a vault episode for you. This is going to be

0:00:15.960 --> 0:00:20.280
<v Speaker 1>the Manta Ray Part one. This one originally published July one,

0:00:20.520 --> 0:00:22.920
<v Speaker 1>twenty twenty five. This is going to be part one

0:00:23.160 --> 0:00:27.200
<v Speaker 1>of three. This one is a tremendous amount of fun

0:00:27.280 --> 0:00:31.280
<v Speaker 1>to research and record, so we hope that you enjoy it,

0:00:31.360 --> 0:00:33.440
<v Speaker 1>either for the first time or for the second time.

0:00:33.479 --> 0:00:34.919
<v Speaker 1>Here let's dive right in.

0:00:38.280 --> 0:00:42.040
<v Speaker 2>Welcome to Stuff to Blow Your Mind production of iHeartRadio.

0:00:48.280 --> 0:00:50.320
<v Speaker 1>Hey you welcome to Stuff to Blow your Mind. My

0:00:50.400 --> 0:00:53.760
<v Speaker 1>name is Robert Lamb and I am Joe McCormick. In

0:00:53.800 --> 0:00:56.639
<v Speaker 1>this episode, we're going to begin our look at the

0:00:56.680 --> 0:01:01.200
<v Speaker 1>Manta ray because I very recently we had the privilege

0:01:01.240 --> 0:01:05.000
<v Speaker 1>to travel with my family to raja Ampat in Indonesia

0:01:05.680 --> 0:01:08.880
<v Speaker 1>for a week of snorkeling, and during that snorkeling, I

0:01:08.920 --> 0:01:12.679
<v Speaker 1>got to observe manta rays while in the water snorkeling,

0:01:12.720 --> 0:01:15.679
<v Speaker 1>and it was just a mind blowing experience. It was

0:01:15.720 --> 0:01:18.960
<v Speaker 1>just magical. I can't quite put it into words exactly,

0:01:19.000 --> 0:01:20.720
<v Speaker 1>but it was one of these situations where as I

0:01:20.760 --> 0:01:23.720
<v Speaker 1>was snorkeling out with the other snorkelers towards this manta

0:01:23.800 --> 0:01:27.960
<v Speaker 1>ray cleaning station. I found myself like mouthing, oh my god,

0:01:27.959 --> 0:01:30.520
<v Speaker 1>oh my God through my breathing apparatus.

0:01:30.959 --> 0:01:33.680
<v Speaker 3>The cleaning station is that, do I understand?

0:01:33.760 --> 0:01:33.840
<v Speaker 1>Right?

0:01:33.880 --> 0:01:36.399
<v Speaker 3>That's a place where they come to sort of be

0:01:36.400 --> 0:01:39.760
<v Speaker 3>be swarmed by fish that will help get parasites or

0:01:39.800 --> 0:01:42.120
<v Speaker 3>other kind of contaminants off of their bodies.

0:01:42.319 --> 0:01:45.680
<v Speaker 1>Correct, This is This is pretty remarkable in its own right,

0:01:45.800 --> 0:01:47.800
<v Speaker 1>and I think we'll get into that more in the

0:01:47.840 --> 0:01:51.240
<v Speaker 1>second episode of this series. But yes, that's what we

0:01:51.240 --> 0:01:56.000
<v Speaker 1>were observing. These were some reef manta rays that had

0:01:56.000 --> 0:01:59.080
<v Speaker 1>come out to the cleaning station so that these various

0:01:59.080 --> 0:02:02.680
<v Speaker 1>fish could eat their parasites. And yeah, it was just

0:02:02.760 --> 0:02:06.440
<v Speaker 1>magical to watch these creatures move through the water like

0:02:06.880 --> 0:02:09.880
<v Speaker 1>some sort of animate black and white cape, you know,

0:02:10.800 --> 0:02:13.959
<v Speaker 1>some sort of an angel or demon, just something almost

0:02:14.000 --> 0:02:15.640
<v Speaker 1>beyond our ability to comprehend.

0:02:16.560 --> 0:02:18.840
<v Speaker 3>It's a bach coming in on the organ as they

0:02:18.880 --> 0:02:19.600
<v Speaker 3>swish around.

0:02:20.040 --> 0:02:23.239
<v Speaker 1>Yeah. Yeah, they're very very dramatic, but also we'll be

0:02:23.280 --> 0:02:26.760
<v Speaker 1>discussing relatively drama free at least as far as what

0:02:26.800 --> 0:02:29.119
<v Speaker 1>they're doing and what they're bringing to the table. There's

0:02:29.240 --> 0:02:32.240
<v Speaker 1>a lot of manta ray drama, but it's almost entirely

0:02:32.280 --> 0:02:35.959
<v Speaker 1>on us, the humans. Yeah, so I want to mention

0:02:36.040 --> 0:02:38.440
<v Speaker 1>up here at the top that we did this snorkeling

0:02:38.480 --> 0:02:43.480
<v Speaker 1>at the Missoul Marine Reserve is also where you find

0:02:43.480 --> 0:02:46.400
<v Speaker 1>the Missoul Resort. The resort is just one leg of

0:02:46.400 --> 0:02:50.520
<v Speaker 1>the overall conservation mission here, which actually started before the

0:02:50.520 --> 0:02:53.440
<v Speaker 1>tourism part of the operation, like the tourism part apparently

0:02:54.120 --> 0:02:57.120
<v Speaker 1>was then built up afterwards to fund the conservation mission.

0:02:57.720 --> 0:02:59.919
<v Speaker 1>And I can't say enough good things about this place.

0:03:00.120 --> 0:03:02.480
<v Speaker 1>Founded on the site of a former shark finning camp

0:03:02.919 --> 0:03:05.720
<v Speaker 1>and in an area that had been previously targeted by

0:03:06.360 --> 0:03:11.040
<v Speaker 1>illegal lumber operations and dynamite fishing, and now through the

0:03:11.080 --> 0:03:15.160
<v Speaker 1>Missoul Foundation, they manage about three hundred thousand acres or

0:03:16.040 --> 0:03:19.359
<v Speaker 1>twelve two hundred square kilometers of marine reserve with two

0:03:19.360 --> 0:03:23.520
<v Speaker 1>distinct no take zones. They engage in various conservation efforts

0:03:23.520 --> 0:03:27.680
<v Speaker 1>such as the Missoul Manta Program, a Reshark program, and

0:03:27.680 --> 0:03:31.240
<v Speaker 1>this includes a program to reintroduce Indo Pacific leopard sharks,

0:03:31.560 --> 0:03:34.760
<v Speaker 1>and they partner with various organizations of various like aquariums

0:03:34.800 --> 0:03:38.480
<v Speaker 1>around the world who have the right eggs egg secs

0:03:38.560 --> 0:03:43.520
<v Speaker 1>to reintroduce, and their partners include Atlanta Zone Georgia Aquarium.

0:03:44.200 --> 0:03:48.040
<v Speaker 1>They're also involved in coral refrustoration, sustainability efforts in various

0:03:48.040 --> 0:03:50.320
<v Speaker 1>community outreach and education programs.

0:03:50.880 --> 0:03:53.040
<v Speaker 3>So you said you were doing a lot of snorkeling here.

0:03:53.080 --> 0:03:55.840
<v Speaker 3>I know y'all are a snorkeling family, right, I have

0:03:55.960 --> 0:03:57.000
<v Speaker 3>no experience with this.

0:03:57.600 --> 0:04:01.000
<v Speaker 1>Yeah. Yeah, my wife got us into it, and you know,

0:04:01.000 --> 0:04:04.480
<v Speaker 1>we'll go on snorkeling excursions here and there, and I

0:04:04.480 --> 0:04:06.320
<v Speaker 1>have to say, yeah, this is the best snorkeling of

0:04:06.320 --> 0:04:09.600
<v Speaker 1>my life thus far. This part of the world is

0:04:09.600 --> 0:04:12.720
<v Speaker 1>in what's known as the Coral Triangle. This is an

0:04:12.760 --> 0:04:16.560
<v Speaker 1>incredibly rich and diverse marine environment that happens to include

0:04:17.760 --> 0:04:21.640
<v Speaker 1>according to the NAA, quote over six hundred reef building

0:04:21.680 --> 0:04:25.239
<v Speaker 1>coral species, seventy five percent of all species known to science,

0:04:25.320 --> 0:04:28.359
<v Speaker 1>three thousand species of reef fish, forty percent of the

0:04:28.360 --> 0:04:31.559
<v Speaker 1>world's coral reef species, and six of the world's seven

0:04:31.600 --> 0:04:35.080
<v Speaker 1>marine turtle species. Also three quarters of known molluscs.

0:04:35.279 --> 0:04:36.000
<v Speaker 3>So it's happening.

0:04:36.400 --> 0:04:38.960
<v Speaker 1>Yeah, it's yeah, just a very very rich place. And

0:04:39.560 --> 0:04:42.640
<v Speaker 1>you know, I'll no doubt come back to other things.

0:04:42.720 --> 0:04:46.120
<v Speaker 1>I observed there in future episodes, but one of the

0:04:46.120 --> 0:04:49.520
<v Speaker 1>many highlights again was getting to observe these reef manta

0:04:49.640 --> 0:04:53.640
<v Speaker 1>rays in the wild. So we'll get back to the

0:04:53.680 --> 0:04:57.400
<v Speaker 1>details of the different the two main different mantes species,

0:04:57.440 --> 0:05:01.320
<v Speaker 1>but this is the second largest of the rays and

0:05:01.360 --> 0:05:05.520
<v Speaker 1>one of only two, possibly three extant manta rays species.

0:05:05.880 --> 0:05:08.160
<v Speaker 1>They can weigh up to fifteen hundred pounds or seven

0:05:08.200 --> 0:05:12.360
<v Speaker 1>hundred kilograms, and that's with a maximum disc width of

0:05:12.440 --> 0:05:16.599
<v Speaker 1>fifteen feet or four hundred and fifty centimeters if you

0:05:16.640 --> 0:05:19.040
<v Speaker 1>were I guess you could sort of frame that as

0:05:19.080 --> 0:05:20.720
<v Speaker 1>their wingspan if you want.

0:05:20.880 --> 0:05:23.480
<v Speaker 3>But you said, so, these are the reef mantas, and

0:05:23.640 --> 0:05:26.279
<v Speaker 3>the largest of the manta rays would be the giant

0:05:26.279 --> 0:05:28.120
<v Speaker 3>oceanic mantas, correct.

0:05:28.200 --> 0:05:30.600
<v Speaker 1>Yeah, and we'll come back to the stats on them

0:05:30.600 --> 0:05:34.239
<v Speaker 1>in a minute. But yeah, in both cases, great bat

0:05:34.480 --> 0:05:37.000
<v Speaker 1>like black and white creatures that seem to glide and

0:05:37.040 --> 0:05:40.880
<v Speaker 1>soar through the depths. And I think I had observed

0:05:41.000 --> 0:05:44.560
<v Speaker 1>some in the water while standing on a sandbar elsewhere

0:05:44.560 --> 0:05:46.919
<v Speaker 1>in the world previously, but this was my first and

0:05:47.000 --> 0:05:49.919
<v Speaker 1>only time getting to see them while in the water,

0:05:50.000 --> 0:05:51.360
<v Speaker 1>and again it was just astounding.

0:05:51.800 --> 0:05:54.719
<v Speaker 3>So I have no experience with snorkeling. But in reading

0:05:54.800 --> 0:05:58.479
<v Speaker 3>up for this episode, I just kept coming across first

0:05:58.520 --> 0:06:03.840
<v Speaker 3>hand descriptions again and again of how strange and amazing

0:06:03.880 --> 0:06:06.280
<v Speaker 3>it was to be in the water with manta rays.

0:06:06.600 --> 0:06:10.760
<v Speaker 3>A common thing these divers and researchers talk about is

0:06:10.800 --> 0:06:16.000
<v Speaker 3>a feeling of kind of intelligent or almost emotional connection

0:06:16.160 --> 0:06:18.839
<v Speaker 3>with the animal that they have not experienced with any

0:06:18.880 --> 0:06:21.960
<v Speaker 3>other fish. Because, to be clear, the manta is not

0:06:22.240 --> 0:06:25.479
<v Speaker 3>like a mammal like dolphins or whales might be that

0:06:25.800 --> 0:06:28.840
<v Speaker 3>you might be more you know, disposed, you might have

0:06:28.880 --> 0:06:31.240
<v Speaker 3>more experience hearing about these kind of connections people have

0:06:31.520 --> 0:06:34.600
<v Speaker 3>with marine mammals. But these are fish, you know, we

0:06:34.600 --> 0:06:38.080
<v Speaker 3>think of them as these very kind of cold creatures

0:06:38.120 --> 0:06:41.440
<v Speaker 3>of limited intelligence, kind of like sharks that seem to

0:06:41.440 --> 0:06:45.280
<v Speaker 3>be mainly just kind of machines acting on impulse. They

0:06:45.320 --> 0:06:48.800
<v Speaker 3>don't have that feeling of emotion and intelligence you might

0:06:48.880 --> 0:06:51.520
<v Speaker 3>get from a mammal. But in this case, this is

0:06:51.560 --> 0:06:54.120
<v Speaker 3>a fish that lots of people say, does it does

0:06:54.200 --> 0:06:56.680
<v Speaker 3>have that feeling. It's like it's there and it's alive,

0:06:56.760 --> 0:06:57.520
<v Speaker 3>and it's thinking.

0:06:58.279 --> 0:07:00.640
<v Speaker 1>Yeah, this is a great point, And I think we'll

0:07:00.680 --> 0:07:04.280
<v Speaker 1>probably get into the intel the brain, the intelligence of

0:07:04.920 --> 0:07:08.280
<v Speaker 1>the manta ray, especially in the next episode. But but

0:07:08.480 --> 0:07:10.720
<v Speaker 1>you do see this observation a lot. There seems to

0:07:10.760 --> 0:07:14.200
<v Speaker 1>be a curiosity on the part of the manta and

0:07:13.880 --> 0:07:16.880
<v Speaker 1>in many ways, this kind of curiosity reminds us of

0:07:16.880 --> 0:07:24.160
<v Speaker 1>our interactions with mammalian marine species like dolphins and whales. Now,

0:07:24.200 --> 0:07:26.560
<v Speaker 1>in the case of our own experiences, I want to

0:07:26.680 --> 0:07:30.960
<v Speaker 1>stress that we observe them while snorkeling, rather than say

0:07:30.960 --> 0:07:32.960
<v Speaker 1>that we swam with them. I guess you could technically

0:07:33.000 --> 0:07:34.360
<v Speaker 1>say we swam them with them. We were in the

0:07:34.400 --> 0:07:36.920
<v Speaker 1>same but the body of water with them, but we

0:07:37.400 --> 0:07:41.240
<v Speaker 1>did keep our distance. We did not chase the manta rays,

0:07:41.280 --> 0:07:43.760
<v Speaker 1>and we certainly did not attempt attempt to touch these

0:07:43.800 --> 0:07:45.200
<v Speaker 1>gentle giants of the sea.

0:07:45.360 --> 0:07:46.720
<v Speaker 3>I assume that's discouraged.

0:07:47.120 --> 0:07:51.600
<v Speaker 1>It is discouraged, yes, And in discussing this, like the

0:07:51.720 --> 0:07:56.280
<v Speaker 1>human desire to touch the manta ray, I wanted to

0:07:56.280 --> 0:08:00.000
<v Speaker 1>get into a preliminary discussion here about the human attitude

0:08:00.320 --> 0:08:05.240
<v Speaker 1>toward the manta ray because this is important because ultimately

0:08:05.320 --> 0:08:08.680
<v Speaker 1>human attitudes towards the manta rays also plays into their

0:08:08.760 --> 0:08:12.480
<v Speaker 1>endangered status in the world, certainly with the oceanic manta.

0:08:13.080 --> 0:08:17.200
<v Speaker 1>So manta rays enjoy a pretty wide range. They're found

0:08:17.240 --> 0:08:21.480
<v Speaker 1>in warm, temperate, subtropical and tropical waters around the world.

0:08:22.000 --> 0:08:25.320
<v Speaker 1>As such, humans and coastal areas within their range have

0:08:25.440 --> 0:08:29.560
<v Speaker 1>known about them for a very long time. Hawaiian, Micronesian,

0:08:29.880 --> 0:08:33.559
<v Speaker 1>Southeast Asian, and South American traditions have viewed the manta

0:08:33.800 --> 0:08:38.240
<v Speaker 1>in varying supernatural lights, as reincarnations of human souls, as

0:08:38.440 --> 0:08:43.520
<v Speaker 1>avatars of a creator deity, as divine protectors, as divine messengers,

0:08:44.160 --> 0:08:47.920
<v Speaker 1>and as such, they've even enjoyed traditional protected status amongst

0:08:47.920 --> 0:08:51.280
<v Speaker 1>certain groups, at least at different times. But there's also

0:08:51.280 --> 0:08:54.160
<v Speaker 1>a darker side to human attitudes toward manta rays. Over

0:08:54.160 --> 0:08:57.000
<v Speaker 1>the past couple of decades, the demand for manta ray

0:08:57.080 --> 0:09:01.920
<v Speaker 1>gill plates in traditional medicine, particularly traditional Chinese medicine, has

0:09:02.000 --> 0:09:06.479
<v Speaker 1>proven devastating from manta ray populations. Based on the unproven

0:09:06.720 --> 0:09:10.280
<v Speaker 1>and to be clear of pseudoscientific idea, the consumption of

0:09:10.320 --> 0:09:13.280
<v Speaker 1>these gills in some sort of like powdered driver and

0:09:13.400 --> 0:09:17.000
<v Speaker 1>or powdered form can boost the human immune system, among

0:09:17.040 --> 0:09:21.160
<v Speaker 1>other supposed benefits. And the story of how this is

0:09:21.679 --> 0:09:24.040
<v Speaker 1>really interesting in its own right. I was reading about

0:09:24.040 --> 0:09:28.679
<v Speaker 1>this in a paper by O'Malley at all titled Characterization

0:09:28.880 --> 0:09:31.560
<v Speaker 1>of the Trade in Manta and Devil ray gill plates

0:09:31.559 --> 0:09:35.199
<v Speaker 1>in China and Southeast Asia through Trader Surveys. This was

0:09:35.200 --> 0:09:40.720
<v Speaker 1>published in twenty sixteen in Aquatic Conservation, Marine and Freshwater Ecosystems,

0:09:41.320 --> 0:09:45.000
<v Speaker 1>and they point out that mention of manta gill plates

0:09:45.360 --> 0:09:49.000
<v Speaker 1>didn't pop up in traditional Chinese medicine publications until around

0:09:49.080 --> 0:09:52.760
<v Speaker 1>nineteen seventy six. This to be clear, despite the fact

0:09:52.760 --> 0:09:56.960
<v Speaker 1>that traditional Chinese medicine itself is very very old, going

0:09:56.960 --> 0:10:02.320
<v Speaker 1>back like five thousand years, widespread and popular form of

0:10:02.360 --> 0:10:07.760
<v Speaker 1>alternative medicine, but the consumption of these gill plates is

0:10:07.880 --> 0:10:13.040
<v Speaker 1>not some sort of deep seated tradition in this alternative

0:10:13.040 --> 0:10:14.079
<v Speaker 1>medicine practice.

0:10:14.200 --> 0:10:16.200
<v Speaker 3>This would not be the only case that something is

0:10:16.240 --> 0:10:20.160
<v Speaker 3>presented as a traditional or ancient cure from some culture

0:10:20.240 --> 0:10:22.160
<v Speaker 3>or other when it is not. It is a fairly

0:10:22.200 --> 0:10:23.959
<v Speaker 3>recent thing people have started doing.

0:10:24.600 --> 0:10:29.480
<v Speaker 1>Yeah. One of my key sources for these episodes is

0:10:29.559 --> 0:10:32.640
<v Speaker 1>twenty eighteen's Guide to the Manta and Devil Rays of

0:10:32.679 --> 0:10:38.160
<v Speaker 1>the World by Stevens, Fernando Dando, and Dyscaria. And in

0:10:38.200 --> 0:10:41.360
<v Speaker 1>this book, which I'll keep coming back to, they say

0:10:41.400 --> 0:10:44.080
<v Speaker 1>that this was all likely a quote clever marketing of

0:10:44.120 --> 0:10:47.800
<v Speaker 1>a readily available and cheap bycatch product. So, in other words,

0:10:48.360 --> 0:10:52.280
<v Speaker 1>various unsustainable fishing practices would be pulling mantas in any way,

0:10:53.240 --> 0:10:55.880
<v Speaker 1>and then they're like, well, let's market the parts of

0:10:55.920 --> 0:10:59.960
<v Speaker 1>this creature and sell it. And then as popularity builds,

0:11:00.040 --> 0:11:03.760
<v Speaker 1>it translates into direct targeting of mantas by what they

0:11:03.760 --> 0:11:06.920
<v Speaker 1>describe as boom and bust fisheries. So, for reasons we'll

0:11:06.920 --> 0:11:10.840
<v Speaker 1>discuss in these episodes, these are vulnerable species that do

0:11:10.920 --> 0:11:14.120
<v Speaker 1>not easily endure this sort of targeted fishing, so these

0:11:14.160 --> 0:11:18.760
<v Speaker 1>operations inherently produce very short lived paydays while doing long

0:11:18.840 --> 0:11:22.960
<v Speaker 1>term damage to the populations. They also note that the

0:11:23.040 --> 0:11:25.480
<v Speaker 1>rise in popularity may also tie in with the rise

0:11:25.559 --> 0:11:29.600
<v Speaker 1>in human respiratory illnesses do in part to pollution, and

0:11:29.640 --> 0:11:34.040
<v Speaker 1>again these pseudoscientific claims. Basically we're dealing with the idea that, Okay,

0:11:36.160 --> 0:11:39.160
<v Speaker 1>these are filters for the fish, and therefore, on some level,

0:11:39.280 --> 0:11:42.080
<v Speaker 1>if I consume them, it's going to help filter me

0:11:42.200 --> 0:11:43.960
<v Speaker 1>out as well. It's going to protect me from the

0:11:43.960 --> 0:11:47.400
<v Speaker 1>things that would harm me in the environment. So again,

0:11:47.440 --> 0:11:50.199
<v Speaker 1>gill plates would seem to be a relatively recent addition

0:11:51.160 --> 0:11:54.360
<v Speaker 1>to traditional Chinese medicine, and one that has had a

0:11:54.480 --> 0:11:58.920
<v Speaker 1>marked impact on the populations of these vulnerable fish species.

0:11:59.240 --> 0:12:02.440
<v Speaker 1>The reef manta is currently flagged as vulnerable, while the

0:12:02.520 --> 0:12:04.600
<v Speaker 1>giant oceanic manta is endangered.

0:12:04.920 --> 0:12:06.920
<v Speaker 3>And I would imagine that we can come back to

0:12:07.120 --> 0:12:09.559
<v Speaker 3>this because I'm sure there's more nuance, but I would

0:12:09.559 --> 0:12:14.040
<v Speaker 3>imagine that they are especially vulnerable to heavy fishing and

0:12:14.080 --> 0:12:17.920
<v Speaker 3>harvesting because they're larger species that have a slower reproductive

0:12:17.920 --> 0:12:18.960
<v Speaker 3>schedule exactly.

0:12:29.240 --> 0:12:31.360
<v Speaker 1>And then historically, on top of all of this, there

0:12:31.400 --> 0:12:35.640
<v Speaker 1>are Western European misconceptions and myths about manta rays and

0:12:35.720 --> 0:12:40.040
<v Speaker 1>devil rays, rooted apparently in the observations of sailors, but

0:12:40.800 --> 0:12:44.120
<v Speaker 1>managing to survive well into the early twentieth century and

0:12:44.360 --> 0:12:47.160
<v Speaker 1>manifesting in written fiction as well as in at least

0:12:47.200 --> 0:12:49.000
<v Speaker 1>a couple of early horror films.

0:12:49.400 --> 0:12:52.520
<v Speaker 3>Yes, so, Rob, at your suggestion, I looked these up.

0:12:52.520 --> 0:12:54.880
<v Speaker 3>You sort of gave me an assignment here, and I

0:12:54.960 --> 0:12:57.480
<v Speaker 3>checked these movies out. Strangely, both of these made in

0:12:57.520 --> 0:13:00.360
<v Speaker 3>the nineteen thirties, you know, I think of the the

0:13:00.400 --> 0:13:04.319
<v Speaker 3>seventies through the nineties is kind of the heyday of oh,

0:13:04.360 --> 0:13:07.200
<v Speaker 3>I don't know, killer monster in the ocean movies of course,

0:13:07.400 --> 0:13:09.400
<v Speaker 3>following Jaws, Jaws is the big one, and then you

0:13:09.400 --> 0:13:12.120
<v Speaker 3>get all the Jaws copycats, you know, Orca and everything

0:13:12.200 --> 0:13:15.880
<v Speaker 3>like that, and then even further down the chain until

0:13:15.920 --> 0:13:18.080
<v Speaker 3>like the real kind of Z grade copycats. You know,

0:13:18.160 --> 0:13:21.040
<v Speaker 3>in the nineties and two thousands, there were just ten

0:13:21.520 --> 0:13:24.480
<v Speaker 3>billion direct to video shark movies made.

0:13:25.800 --> 0:13:29.000
<v Speaker 1>Yeah, that is a great observation, especially since what is it,

0:13:29.000 --> 0:13:34.079
<v Speaker 1>fifty years of Jaws now celebrating a major birthday.

0:13:34.480 --> 0:13:37.320
<v Speaker 3>But yeah, I mean, you can't deny the power of Jaws.

0:13:37.320 --> 0:13:40.080
<v Speaker 3>Like as much as I hate to contribute to the

0:13:40.120 --> 0:13:42.880
<v Speaker 3>demonizing of of ocean creatures, Jaws is just a banger.

0:13:42.920 --> 0:13:44.079
<v Speaker 3>It's a great movie. It is.

0:13:44.200 --> 0:13:48.640
<v Speaker 1>It's a great film. It changed movies forever. You can't

0:13:48.640 --> 0:13:51.400
<v Speaker 1>talk about blockbusters without talking about Jaws. You can't talk

0:13:51.440 --> 0:13:55.920
<v Speaker 1>about monster movies really without talking talking about Jaws. But

0:13:56.000 --> 0:13:58.520
<v Speaker 1>it is interesting in pointing out that films like Jaws

0:13:58.520 --> 0:14:02.160
<v Speaker 1>arise in the nineteen seventies and then various other creatures

0:14:02.200 --> 0:14:05.360
<v Speaker 1>are drawn into the mix. But the seventies seem to

0:14:05.400 --> 0:14:09.839
<v Speaker 1>be the time period during which in the Europeans in

0:14:09.880 --> 0:14:12.559
<v Speaker 1>the West woke up to the idea that, oh, yeah,

0:14:12.600 --> 0:14:15.800
<v Speaker 1>manterrays are fine. They're like absolutely not threatening anybody. Not

0:14:15.880 --> 0:14:19.280
<v Speaker 1>only are they not threatening, not actually threatening, it's hard

0:14:19.320 --> 0:14:21.960
<v Speaker 1>to conceive of them being threatening. Like, we can't even

0:14:22.520 --> 0:14:25.440
<v Speaker 1>think about making a monster movie about something so tame.

0:14:25.520 --> 0:14:27.560
<v Speaker 1>We'll make one about the killer rabbits first.

0:14:27.840 --> 0:14:29.960
<v Speaker 3>I feel like the stuff you would get later, like

0:14:30.000 --> 0:14:33.640
<v Speaker 3>in the eighties is movies that had friendly aliens that

0:14:33.680 --> 0:14:37.320
<v Speaker 3>were basically manter ray shaped. I can't even remember what

0:14:37.360 --> 0:14:39.520
<v Speaker 3>movie I'm thinking of, but I can picture it in

0:14:39.560 --> 0:14:44.120
<v Speaker 3>my mind, like a gentle, sort of illuminated, bioluminescent, floating

0:14:44.200 --> 0:14:47.320
<v Speaker 3>manta ray with intelligence that's like communicating with a child

0:14:47.440 --> 0:14:49.640
<v Speaker 3>or something. Does that ring any bells for you?

0:14:49.680 --> 0:14:53.200
<v Speaker 1>Who that one? Not specifically, but I was reading doing

0:14:53.200 --> 0:14:56.640
<v Speaker 1>some additional reading, and there are various examples of creatures

0:14:56.720 --> 0:14:59.360
<v Speaker 1>in sci fi that say, live in the atmosphere of

0:14:59.440 --> 0:15:03.640
<v Speaker 1>Jupiter at least partially based on the manta ray. Oh, like,

0:15:03.920 --> 0:15:07.440
<v Speaker 1>it just has a pleasing ethereal form. Again, it's like

0:15:07.520 --> 0:15:09.560
<v Speaker 1>to the point where it's almost hard for us to

0:15:09.560 --> 0:15:12.680
<v Speaker 1>put ourselves in the mindset of someone who sees a

0:15:12.720 --> 0:15:15.640
<v Speaker 1>manta ray and thinks about it as a relentless killer.

0:15:16.120 --> 0:15:18.120
<v Speaker 3>Oh, the Jupiter when you mentioned rang a Bell, because

0:15:18.120 --> 0:15:20.040
<v Speaker 3>we just talked about the story in our series on

0:15:20.120 --> 0:15:23.760
<v Speaker 3>the Great Storm the big Red Spot of Jupiter, because

0:15:23.800 --> 0:15:26.320
<v Speaker 3>that was in a meeting with Medusa by Arthur C. Clark.

0:15:26.440 --> 0:15:28.520
<v Speaker 3>One of the aliens they meet. There is like a

0:15:28.560 --> 0:15:31.560
<v Speaker 3>giant manta ray in the atmosphere of Jupiter. But anyway,

0:15:31.600 --> 0:15:33.000
<v Speaker 3>we got it, okay, So we got to talk about

0:15:33.000 --> 0:15:36.480
<v Speaker 3>these manta horror movies from the nineteen thirties, neither of

0:15:36.520 --> 0:15:39.840
<v Speaker 3>which exactly lives up to that promise, but they're both

0:15:39.920 --> 0:15:43.000
<v Speaker 3>kind of marketed that way. So one of these movies

0:15:43.120 --> 0:15:47.960
<v Speaker 3>is called The Sea Bat Sea, not c the letter

0:15:48.000 --> 0:15:51.680
<v Speaker 3>Sea Bat Sea Bat from nineteen thirty This is a

0:15:51.720 --> 0:15:57.359
<v Speaker 3>pre code American romantic melodrama directed by Wesley Ruggles. Apparently,

0:15:57.440 --> 0:16:02.040
<v Speaker 3>in early production, Todd Browning was somehow attached to this

0:16:02.160 --> 0:16:04.560
<v Speaker 3>and it was maybe supposed to be a vehicle featuring

0:16:04.960 --> 0:16:08.400
<v Speaker 3>Lon Cheney, but that never worked out. So this was

0:16:08.440 --> 0:16:12.120
<v Speaker 3>directed by Wesley Ruggles, shot in Mexico, starring Charles Bickford,

0:16:12.240 --> 0:16:16.120
<v Speaker 3>Raquel Torres, and Nil's Astor, and it even has Boris

0:16:16.160 --> 0:16:18.760
<v Speaker 3>Karloff in a small role. This came out a year

0:16:18.800 --> 0:16:21.960
<v Speaker 3>before Karloff's big break in Frankenstein that was thirty one.

0:16:22.920 --> 0:16:25.720
<v Speaker 3>So this is set on an island in the Caribbean

0:16:26.000 --> 0:16:29.280
<v Speaker 3>and the story follows a character named Nina played by

0:16:29.320 --> 0:16:33.240
<v Speaker 3>Mexican actress Raquel Torres, who is either in love with

0:16:33.640 --> 0:16:36.800
<v Speaker 3>or is the sister of, depending on which synopsis you read.

0:16:36.840 --> 0:16:40.520
<v Speaker 3>I was not able to watch this movie before recording today.

0:16:40.840 --> 0:16:42.720
<v Speaker 3>Is either in love with or is the sister of

0:16:42.880 --> 0:16:46.880
<v Speaker 3>a sponge diver named Carl. Sadly, Carl is killed when

0:16:46.880 --> 0:16:50.880
<v Speaker 3>his diving party is attacked by a dreaded local creature

0:16:51.000 --> 0:16:54.600
<v Speaker 3>known as the sea bat, and this is described in

0:16:54.640 --> 0:16:57.840
<v Speaker 3>some sources as a giant manta ray, in other sources

0:16:57.880 --> 0:17:01.720
<v Speaker 3>as a sting ray, which, as we'll discuss more throughout

0:17:01.720 --> 0:17:04.280
<v Speaker 3>the series, that those are not the same thing, though

0:17:04.480 --> 0:17:07.800
<v Speaker 3>some publications describing the movie seem not to recognize that

0:17:07.840 --> 0:17:09.760
<v Speaker 3>there is a difference. I think they just think, like

0:17:09.840 --> 0:17:14.600
<v Speaker 3>Mantrey's arsting rays, same thing. In some effects shots you

0:17:14.640 --> 0:17:17.240
<v Speaker 3>can see it really doesn't look like either one rob

0:17:17.280 --> 0:17:20.320
<v Speaker 3>I put one screenshot in here for you. There are

0:17:20.400 --> 0:17:23.439
<v Speaker 3>shots of it underwater where it I don't know, it's

0:17:23.440 --> 0:17:26.480
<v Speaker 3>shaped kind of like an airplane or like a spaceship

0:17:26.520 --> 0:17:29.600
<v Speaker 3>of some kind, and then there are some shots where

0:17:29.600 --> 0:17:31.800
<v Speaker 3>you see it at the water line and it looks

0:17:31.880 --> 0:17:36.040
<v Speaker 3>just more like a giant shark or tuna type creature. Anyway,

0:17:36.080 --> 0:17:40.920
<v Speaker 3>after the tragic loss of Carl in this seabat related incident,

0:17:41.200 --> 0:17:44.600
<v Speaker 3>the character Nina starts getting into voodoo and then declares

0:17:44.640 --> 0:17:46.920
<v Speaker 3>that she will marry any man who can kill the

0:17:47.000 --> 0:17:50.320
<v Speaker 3>dreaded sea bat. Several men try and fail, and then

0:17:50.320 --> 0:17:54.080
<v Speaker 3>eventually a traveling preacher named Reverend Sims comes to town.

0:17:54.160 --> 0:17:57.959
<v Speaker 3>This is Charles Bickford, and he somehow both converts Nina

0:17:58.000 --> 0:18:00.600
<v Speaker 3>to Christianity. He leads her out of were packed with

0:18:00.680 --> 0:18:04.600
<v Speaker 3>voodoo and falls in love with her, and it's a

0:18:04.680 --> 0:18:07.000
<v Speaker 3>tragic romance, I guess, or I don't know how tragic.

0:18:07.040 --> 0:18:09.200
<v Speaker 3>I think. They do end up happily together at the end.

0:18:09.840 --> 0:18:12.000
<v Speaker 3>But there is a twist because it turns out Reverend

0:18:12.080 --> 0:18:15.919
<v Speaker 3>Sims is actually an escaped convict pretending to be a minister.

0:18:16.800 --> 0:18:19.720
<v Speaker 3>And then some of Nina's other jealous suitors try to

0:18:19.760 --> 0:18:22.080
<v Speaker 3>capture him and turn him in for the bounty. But

0:18:22.359 --> 0:18:24.159
<v Speaker 3>on the way there they're like on a boat, and

0:18:24.200 --> 0:18:26.439
<v Speaker 3>the boat gets attacked by the sea bat, so they

0:18:26.480 --> 0:18:30.120
<v Speaker 3>get sea batted, but Reverend Sims survives and he goes

0:18:30.160 --> 0:18:32.760
<v Speaker 3>back to Nina, and I guess they live happily ever after.

0:18:33.320 --> 0:18:36.280
<v Speaker 3>That's what I could piece together reading various synopsis online

0:18:36.880 --> 0:18:40.560
<v Speaker 3>from the American Film Institute Catalog's historical entry on the movie.

0:18:40.600 --> 0:18:42.600
<v Speaker 3>I just wanted to read a couple of production notes

0:18:42.640 --> 0:18:48.800
<v Speaker 3>because they factor into the stingray or Manta ray discussion. Quote.

0:18:49.119 --> 0:18:51.920
<v Speaker 3>According to the Telegraph News, the movie, with its crew

0:18:51.960 --> 0:18:55.240
<v Speaker 3>of sixty two personnel, was quote believed to be the

0:18:55.359 --> 0:18:59.640
<v Speaker 3>largest motion picture expedition to leave Hollywood for another American country.

0:19:00.119 --> 0:19:03.639
<v Speaker 3>The production required three pullmans and two baggage cars with

0:19:03.680 --> 0:19:07.080
<v Speaker 3>two hundred tons of equipment, and an inventory of articles

0:19:07.119 --> 0:19:10.120
<v Speaker 3>taken into Mexico under customs bond covered by more than

0:19:10.160 --> 0:19:13.240
<v Speaker 3>one thousand pages and showed a total value of eighty

0:19:13.320 --> 0:19:17.000
<v Speaker 3>thousand dollars. The article also claimed that the titular subject

0:19:17.040 --> 0:19:20.320
<v Speaker 3>of the film, the Giant Stingray, was filmed for the

0:19:20.359 --> 0:19:22.560
<v Speaker 3>first time in the sea bat.

0:19:23.920 --> 0:19:26.800
<v Speaker 1>The giant stingray, Now, I'm not sure where that would

0:19:26.840 --> 0:19:30.159
<v Speaker 1>be that there is a giant freshwater stingray, but I

0:19:30.160 --> 0:19:32.199
<v Speaker 1>think this is a creature you find in touch tanks.

0:19:32.200 --> 0:19:35.520
<v Speaker 1>This is not in captivity. I don't think this is

0:19:35.560 --> 0:19:38.400
<v Speaker 1>something that is going to be that threatening.

0:19:38.920 --> 0:19:41.199
<v Speaker 3>And once again, like I said, I couldn't watch the

0:19:41.200 --> 0:19:43.720
<v Speaker 3>whole movie, but in the clips I saw, there were

0:19:43.720 --> 0:19:46.720
<v Speaker 3>two different ways the sea bat looked, and neither of

0:19:46.760 --> 0:19:51.360
<v Speaker 3>them looked like a real animal anyway. Not clear if

0:19:51.400 --> 0:19:54.359
<v Speaker 3>anybody involved here knew the difference between a stingray and

0:19:54.400 --> 0:19:58.399
<v Speaker 3>a manta ray, which is rob cee if you follow

0:19:58.440 --> 0:20:00.520
<v Speaker 3>me here. I think that's somewhat common. Bolt of the

0:20:00.520 --> 0:20:03.639
<v Speaker 3>difference between like a great white shark and a whale shark,

0:20:04.080 --> 0:20:07.160
<v Speaker 3>like pretty different organisms. One's a filter feeder, the others

0:20:07.200 --> 0:20:09.040
<v Speaker 3>a predator right right.

0:20:09.000 --> 0:20:10.560
<v Speaker 1>And even then with the sting right that, I think

0:20:10.560 --> 0:20:13.120
<v Speaker 1>there's depending on what type of stingray, you have different

0:20:13.200 --> 0:20:15.000
<v Speaker 1>forms of feeding that are taking place.

0:20:15.080 --> 0:20:18.920
<v Speaker 3>But yeah, essentially many reviewers of Sea Bat also say

0:20:19.080 --> 0:20:24.720
<v Speaker 3>not enough sea bat seabat sequences are limited, And yeah,

0:20:24.760 --> 0:20:26.720
<v Speaker 3>so in the in the scene I did see of

0:20:26.760 --> 0:20:29.080
<v Speaker 3>it chasing the boat, it's like attacking the boat as

0:20:29.080 --> 0:20:32.080
<v Speaker 3>they're out on the water. It's basically jaws. The creature

0:20:32.080 --> 0:20:34.360
<v Speaker 3>looks like a cross between kind of like a sting ray,

0:20:34.440 --> 0:20:36.600
<v Speaker 3>but also like a shark and kind of a giant

0:20:36.640 --> 0:20:41.480
<v Speaker 3>silver tuna type thing. The other killer Manta movie that

0:20:41.520 --> 0:20:45.879
<v Speaker 3>you flagged for me is The Devil Monster, which was

0:20:45.920 --> 0:20:48.240
<v Speaker 3>released in several different years. There was a nineteen thirty

0:20:48.280 --> 0:20:51.199
<v Speaker 3>six version nineteen forty six version, also known as The

0:20:51.280 --> 0:20:56.119
<v Speaker 3>Sea Fiend. This is yet another production at least somewhat

0:20:56.160 --> 0:21:00.000
<v Speaker 3>marketed as ray horror, but it actually features relatively little

0:21:00.119 --> 0:21:03.320
<v Speaker 3>on screen ray action. So it was first made in

0:21:03.400 --> 0:21:06.879
<v Speaker 3>nineteen thirty six, re edited and re released multiple times,

0:21:06.920 --> 0:21:10.280
<v Speaker 3>including in nineteen forty six when it was beefed up

0:21:10.280 --> 0:21:13.399
<v Speaker 3>with a bunch of exploitation content, which included footage of

0:21:13.440 --> 0:21:17.200
<v Speaker 3>what appears to be sadly genuine animal cruelty, like forcing

0:21:17.240 --> 0:21:21.160
<v Speaker 3>live animals to fight each other, and then also stock

0:21:21.480 --> 0:21:25.560
<v Speaker 3>documentary footage of Native Pacific islanders just going about their

0:21:25.600 --> 0:21:28.960
<v Speaker 3>daily life included, no doubt, because this was a way

0:21:29.080 --> 0:21:33.280
<v Speaker 3>around Hayes Code prohibitions on nudity at the time. This

0:21:33.440 --> 0:21:36.440
<v Speaker 3>was directed by s Edwin Graham. The basic plot of

0:21:36.480 --> 0:21:38.800
<v Speaker 3>the nineteen forty six version is about a mission to

0:21:38.840 --> 0:21:42.040
<v Speaker 3>find a missing sailor whose ship was wrecked on the Galapagos.

0:21:43.160 --> 0:21:45.800
<v Speaker 3>Though apparently huge stretches of the movie take a break

0:21:45.800 --> 0:21:48.800
<v Speaker 3>from the main narrative to just show octopus fights or

0:21:48.920 --> 0:21:54.280
<v Speaker 3>topless women processing grain, and the climax has several characters

0:21:54.320 --> 0:21:57.320
<v Speaker 3>forced to battle a giant manta ray that is said

0:21:57.359 --> 0:22:00.960
<v Speaker 3>to be a threat to the local tuna fishermen. So

0:22:01.040 --> 0:22:03.280
<v Speaker 3>once again, you got you got a monster manta ray

0:22:03.840 --> 0:22:06.040
<v Speaker 3>the monster. So I looked at this part where they're

0:22:06.040 --> 0:22:09.120
<v Speaker 3>battling the ray, and it does look much more clearly

0:22:09.240 --> 0:22:12.440
<v Speaker 3>like a ray. Unfortunately, I think in this case that's

0:22:12.480 --> 0:22:15.159
<v Speaker 3>because it is a real manta ray, and the film's

0:22:15.200 --> 0:22:19.160
<v Speaker 3>action climax is just an unsimulated harpooning of a real animal.

0:22:19.400 --> 0:22:21.440
<v Speaker 1>Oh well, that's that's quite unfortunate.

0:22:21.960 --> 0:22:24.240
<v Speaker 3>So from a distance, I'm going to give a preemptive

0:22:24.280 --> 0:22:26.280
<v Speaker 3>thumbs down to both of these movies.

0:22:26.920 --> 0:22:29.919
<v Speaker 1>Yeah, I don't think either of these are are contenders

0:22:29.920 --> 0:22:31.280
<v Speaker 1>for weird house cinema treatment.

0:22:31.520 --> 0:22:35.720
<v Speaker 3>Yeah, but it does raise this question, like because it's

0:22:35.760 --> 0:22:39.919
<v Speaker 3>framing them, framing rays as this monster that attacks humans

0:22:39.960 --> 0:22:42.520
<v Speaker 3>and you know, threatens boats and all. This was it

0:22:42.600 --> 0:22:45.920
<v Speaker 3>common before the modern era to view manta rays as

0:22:45.960 --> 0:22:48.840
<v Speaker 3>a kind of monster, or at least a potentially dangerous

0:22:48.880 --> 0:22:51.200
<v Speaker 3>animal like its cousins the predatory sharks.

0:22:52.200 --> 0:22:52.440
<v Speaker 1>Uh.

0:22:52.480 --> 0:22:55.240
<v Speaker 3>And yes, I did find evidence that this was just

0:22:55.720 --> 0:22:58.679
<v Speaker 3>kind of common sailor's lore that rays would you know,

0:22:58.720 --> 0:23:02.240
<v Speaker 3>could be dangerous attack you, They might attack boats, they

0:23:02.320 --> 0:23:06.600
<v Speaker 3>might attack divers. One article I came across that was

0:23:06.640 --> 0:23:10.360
<v Speaker 3>recounting some of this folklore was from nineteen ten by

0:23:10.400 --> 0:23:13.479
<v Speaker 3>the American biologist Theodore Gill. It's called the Story of

0:23:13.600 --> 0:23:16.920
<v Speaker 3>the Devilfish. That name can be a little confusing because

0:23:16.920 --> 0:23:21.119
<v Speaker 3>the term devilfish or devil ray is still used today

0:23:21.200 --> 0:23:25.200
<v Speaker 3>to refer to a number of species within the genus Mobula,

0:23:25.680 --> 0:23:28.760
<v Speaker 3>and that is the genus to which the manta rays belong. Basically,

0:23:28.840 --> 0:23:32.320
<v Speaker 3>manta rays are the largest couple of species within the

0:23:32.400 --> 0:23:35.560
<v Speaker 3>genus Mobula, and then some of the other species within

0:23:35.600 --> 0:23:39.800
<v Speaker 3>the genus Mobula are often called like devil rays or devilfish.

0:23:39.960 --> 0:23:43.359
<v Speaker 3>But the term, I think also is still sometimes used

0:23:43.520 --> 0:23:46.880
<v Speaker 3>to refer to just the rays in this genome more generally,

0:23:47.119 --> 0:23:49.720
<v Speaker 3>so I know that's confusing. I think the lower Gill

0:23:49.920 --> 0:23:53.160
<v Speaker 3>is talking about in this article probably does not observe

0:23:53.280 --> 0:23:56.360
<v Speaker 3>distinctions between devil rays and manta rays as we would

0:23:56.400 --> 0:23:59.280
<v Speaker 3>sort them today. It's probably just sailors are looking at

0:23:59.280 --> 0:24:02.720
<v Speaker 3>this thing's based manta ray shaped. These things probably look

0:24:02.800 --> 0:24:05.160
<v Speaker 3>mostly the same to sailors. That's got you know, it's

0:24:05.200 --> 0:24:07.199
<v Speaker 3>got the wings, and it's got something that looks like

0:24:07.240 --> 0:24:10.080
<v Speaker 3>horns in the front, and it's big. So that's one

0:24:10.080 --> 0:24:14.119
<v Speaker 3>of these devilfish or devil rays. Gil in the beginning

0:24:14.160 --> 0:24:17.800
<v Speaker 3>of this article attests to common associations made between what

0:24:17.880 --> 0:24:22.760
<v Speaker 3>he calls the great ray and devils, vampires, and bats,

0:24:22.960 --> 0:24:26.920
<v Speaker 3>and he mentions that common names include the sea bat

0:24:27.160 --> 0:24:31.600
<v Speaker 3>like in the movie. And then concerning these associations with bats,

0:24:32.400 --> 0:24:36.000
<v Speaker 3>he's quoting another author named Holder, and he writes, quote

0:24:36.119 --> 0:24:40.679
<v Speaker 3>Holder thought that quote no more diabolical creature could be imagined.

0:24:41.080 --> 0:24:44.840
<v Speaker 3>They resembled enormous bats, and in following one another around

0:24:44.920 --> 0:24:47.680
<v Speaker 3>the circle, raised the outer tip of the long wing

0:24:47.880 --> 0:24:50.920
<v Speaker 3>like fin high out of the water in a graceful curve,

0:24:51.200 --> 0:24:55.159
<v Speaker 3>the other being deeply submerged. But then Gil goes on

0:24:55.240 --> 0:24:58.600
<v Speaker 3>to say, quote another name for the monster ray has

0:24:58.640 --> 0:25:01.840
<v Speaker 3>been borrowed from the Spanish. Among the fishermen and especially

0:25:01.920 --> 0:25:05.080
<v Speaker 3>the pearl divers of Central America and western Mexico, it

0:25:05.119 --> 0:25:08.000
<v Speaker 3>is known as the manta. This is a Spanish term

0:25:08.240 --> 0:25:11.720
<v Speaker 3>meaning originally blanket, and was given by the fishermen in

0:25:11.800 --> 0:25:14.800
<v Speaker 3>parts of Spain and the island of Mallorca to a

0:25:14.840 --> 0:25:19.359
<v Speaker 3>species of the Mediterranean, and extended thence to similar fishes

0:25:19.400 --> 0:25:22.080
<v Speaker 3>of other regions. It has been explained that the name

0:25:22.160 --> 0:25:24.800
<v Speaker 3>was given by the Spaniards of America to the devilfish

0:25:24.880 --> 0:25:28.919
<v Speaker 3>because it was alleged to hover over and cover a

0:25:28.960 --> 0:25:32.840
<v Speaker 3>fisherman at the bottom as a blanket preparatory to killing

0:25:32.920 --> 0:25:37.160
<v Speaker 3>him for good. The belief, indeed, that the devilfish may

0:25:37.240 --> 0:25:40.320
<v Speaker 3>so attack a man, is not only widely spread, but

0:25:40.520 --> 0:25:44.160
<v Speaker 3>of an ancient origin. Such an idea, however, is contrary

0:25:44.240 --> 0:25:47.040
<v Speaker 3>to our knowledge of the fish. Like several other of

0:25:47.080 --> 0:25:51.640
<v Speaker 3>the gigantic sealations, its diet is in almost inverse ratio

0:25:51.880 --> 0:25:55.800
<v Speaker 3>to its size. So already in nineteen ten, Theodore Ghill

0:25:55.920 --> 0:25:58.959
<v Speaker 3>is not going for the lord that the rays fold

0:25:59.040 --> 0:26:01.720
<v Speaker 3>down like a death blanket over the divers to cover

0:26:01.760 --> 0:26:04.399
<v Speaker 3>them on the bottom and prepare them for death. But

0:26:04.600 --> 0:26:06.920
<v Speaker 3>I did want to say I think he is sort

0:26:06.920 --> 0:26:10.439
<v Speaker 3>of onto something when commenting about the idea of the

0:26:10.520 --> 0:26:14.600
<v Speaker 3>diet being in almost inverse ratio to its size. This

0:26:14.640 --> 0:26:16.760
<v Speaker 3>is not like a hard and fast rule, and there

0:26:16.800 --> 0:26:20.240
<v Speaker 3>are very big, active predators that prey on large animals.

0:26:21.160 --> 0:26:24.520
<v Speaker 3>But many of the largest animals in the ocean, and

0:26:24.600 --> 0:26:29.400
<v Speaker 3>the largest species within different marine lineages, are filter feeders,

0:26:29.440 --> 0:26:33.480
<v Speaker 3>feeding entirely on tiny organisms and small bits of organic matter.

0:26:33.520 --> 0:26:35.760
<v Speaker 3>And this is true of course of the giant oceanic

0:26:35.800 --> 0:26:40.159
<v Speaker 3>manta ray. Now why would that be If you have

0:26:40.240 --> 0:26:43.800
<v Speaker 3>a big filter feeding surface and basically like a big

0:26:43.880 --> 0:26:46.399
<v Speaker 3>kind of bowl shaped mouth that functions like a sieve,

0:26:47.000 --> 0:26:49.600
<v Speaker 3>and a big body that can store a lot of

0:26:49.720 --> 0:26:53.080
<v Speaker 3>energy for time in between feeding booms, it can be

0:26:53.119 --> 0:26:56.440
<v Speaker 3>an awesomely efficient way to live, and with a large

0:26:56.480 --> 0:26:58.440
<v Speaker 3>body yourself, you don't need to worry a whole lot

0:26:58.440 --> 0:27:02.159
<v Speaker 3>about predators. From what I've been reading, the only real

0:27:02.320 --> 0:27:05.919
<v Speaker 3>predators of the giant oceanic manta rays are humans, of course,

0:27:06.000 --> 0:27:10.160
<v Speaker 3>and maybe some toothed whales like orcas, and I think

0:27:10.240 --> 0:27:13.080
<v Speaker 3>sharks may sometimes bite them as well, but I understand

0:27:13.080 --> 0:27:15.960
<v Speaker 3>sharks are not major predators for giant mantas.

0:27:16.359 --> 0:27:19.160
<v Speaker 1>Yeah, we'll come back to this, but basically that's the case,

0:27:19.359 --> 0:27:23.159
<v Speaker 1>but with some variations depending on exactly where in the

0:27:23.200 --> 0:27:27.960
<v Speaker 1>world you are, Like the actually what the surrounding environment

0:27:28.200 --> 0:27:31.000
<v Speaker 1>is consisting of, and you know where the mantas are living.

0:27:31.240 --> 0:27:33.560
<v Speaker 3>Yeah, So in general that there are a lot of

0:27:33.640 --> 0:27:37.040
<v Speaker 3>upsides to being a big filter feeding organism. If you're big,

0:27:37.320 --> 0:27:39.879
<v Speaker 3>you don't have to worry much about predators. You don't

0:27:39.920 --> 0:27:42.840
<v Speaker 3>have to be all that like fast or dangerous or anything.

0:27:42.880 --> 0:27:44.679
<v Speaker 3>You just kind of have to like cruise around with

0:27:44.760 --> 0:27:48.240
<v Speaker 3>a big filter feeding surface, scoop in a lot of stuff,

0:27:48.480 --> 0:27:50.679
<v Speaker 3>just take it all in and get huge amounts of

0:27:50.680 --> 0:27:53.960
<v Speaker 3>biomassing going straight into your metabolism, and then store a

0:27:54.000 --> 0:27:56.320
<v Speaker 3>lot of it for later. That's another thing that people

0:27:56.359 --> 0:27:58.840
<v Speaker 3>often don't think about about the advantages of having a

0:27:58.880 --> 0:28:01.800
<v Speaker 3>big body by a lot. You know, you think, well,

0:28:01.840 --> 0:28:03.720
<v Speaker 3>it's good to be bigger if you're in a fight.

0:28:03.800 --> 0:28:06.679
<v Speaker 3>I mean sometimes that's true, yes, but it's also just

0:28:06.760 --> 0:28:09.320
<v Speaker 3>like you've got a big freezer. Basically you can store

0:28:09.359 --> 0:28:10.879
<v Speaker 3>a lot of energy in that body.

0:28:11.359 --> 0:28:13.000
<v Speaker 1>But of course a big part of this is in

0:28:13.080 --> 0:28:16.440
<v Speaker 1>doing this as an organism, you become a specialist. Right.

0:28:16.520 --> 0:28:18.280
<v Speaker 3>So if you're a giant manta ray and you come

0:28:18.320 --> 0:28:21.640
<v Speaker 3>across some divers in the water, I mean those divers

0:28:21.720 --> 0:28:24.199
<v Speaker 3>might be delicious and full of nutrition, but you just

0:28:24.240 --> 0:28:26.359
<v Speaker 3>there's nothing much you can do with them. Like, you

0:28:26.400 --> 0:28:28.720
<v Speaker 3>don't even have the tools really to eat that diver

0:28:28.800 --> 0:28:29.439
<v Speaker 3>if you wanted to.

0:28:29.800 --> 0:28:33.000
<v Speaker 1>Yeah, that ship sailed long ago. Well, one can only

0:28:33.040 --> 0:28:35.879
<v Speaker 1>imagine that this is based perhaps on the fact that,

0:28:35.920 --> 0:28:38.800
<v Speaker 1>of course they're big, and it's natural for a human

0:28:38.840 --> 0:28:41.840
<v Speaker 1>being in the water outside of their element to be

0:28:41.880 --> 0:28:45.240
<v Speaker 1>a little spooked by large fish. I mean, that's common

0:28:45.240 --> 0:28:48.360
<v Speaker 1>you encounter, that's snorkeling. I feel, unless I know for

0:28:48.440 --> 0:28:50.560
<v Speaker 1>certain what I'm looking at, I would be a little

0:28:51.160 --> 0:28:54.040
<v Speaker 1>nervous around a large fish in the water. And then

0:28:54.160 --> 0:28:55.960
<v Speaker 1>on top of that, we have this we've already talked

0:28:56.000 --> 0:28:59.720
<v Speaker 1>about how there are observations of manta rays being curious

0:29:00.120 --> 0:29:03.360
<v Speaker 1>concerning humans, Manta rays more than devil rays, I'm to understand,

0:29:03.640 --> 0:29:05.400
<v Speaker 1>But that would of course add to it. If you're

0:29:05.440 --> 0:29:07.479
<v Speaker 1>already a little nervous around a big animal and it

0:29:07.520 --> 0:29:11.280
<v Speaker 1>is even halfway curious about you, that might also lead

0:29:11.280 --> 0:29:12.320
<v Speaker 1>to this kind of conclusion.

0:29:12.720 --> 0:29:15.920
<v Speaker 3>Right, And while manta rays are very well known for

0:29:16.000 --> 0:29:18.480
<v Speaker 3>not being aggressive towards humans, I mean, it would still

0:29:18.760 --> 0:29:21.400
<v Speaker 3>be totally possible for one to just like injure you

0:29:21.440 --> 0:29:23.440
<v Speaker 3>by accident if you're getting too close. I mean, they're

0:29:23.440 --> 0:29:25.680
<v Speaker 3>big animals, you know, Yeah, and roll over, so like

0:29:25.720 --> 0:29:27.560
<v Speaker 3>you just you know, keep your distance.

0:29:27.880 --> 0:29:30.120
<v Speaker 1>Yeah, And it's my understanding that as far as any

0:29:30.200 --> 0:29:35.120
<v Speaker 1>kind of like recorded accounts of even minor injuries concerning

0:29:35.360 --> 0:29:38.760
<v Speaker 1>manta rays and injuries to human beings, it's involved people

0:29:38.840 --> 0:29:41.080
<v Speaker 1>getting too close to them, trying to ride them, and

0:29:41.120 --> 0:29:43.080
<v Speaker 1>so forth, which you are not supposed to do.

0:29:43.280 --> 0:29:46.920
<v Speaker 3>So, despite their reputation as diabolical, you know, vampire bats

0:29:46.920 --> 0:29:50.280
<v Speaker 3>of the sea, or as some kind of underwater death blanket, no,

0:29:50.880 --> 0:29:54.440
<v Speaker 3>giant mant rays or mantrays generally devil rays as well,

0:29:54.760 --> 0:29:57.040
<v Speaker 3>are generally not to be thought of as a threat

0:29:57.040 --> 0:30:00.840
<v Speaker 3>to humans. Generally not very aggressive and not anything to

0:30:00.840 --> 0:30:04.280
<v Speaker 3>be all that concerned about. But there is one other

0:30:04.360 --> 0:30:08.480
<v Speaker 3>thing I came across in Gill's article that really does

0:30:08.520 --> 0:30:10.960
<v Speaker 3>paint a kind of scary picture, not because of the

0:30:11.600 --> 0:30:15.160
<v Speaker 3>ray doing anything threatening, but just because of the sonic

0:30:15.200 --> 0:30:19.400
<v Speaker 3>atmosphere it creates. And this is Gil describing the experience

0:30:19.440 --> 0:30:21.840
<v Speaker 3>of what it's like to be around one of these

0:30:21.880 --> 0:30:24.840
<v Speaker 3>giant rays jumping out of the water, which they often do,

0:30:26.080 --> 0:30:29.200
<v Speaker 3>so Gil writes, quote, it is the great leaps out

0:30:29.200 --> 0:30:32.479
<v Speaker 3>of the water that are most striking, especially during the

0:30:32.480 --> 0:30:35.680
<v Speaker 3>stillness of the night Holder on such an occasion on

0:30:35.720 --> 0:30:38.600
<v Speaker 3>the outer FLOORI to reef first encountered the fish and

0:30:38.640 --> 0:30:41.560
<v Speaker 3>then quoting Holder, he says, quote, there came out of

0:30:41.560 --> 0:30:45.080
<v Speaker 3>the darkness near at hand, a rushing, swishing noise, then

0:30:45.120 --> 0:30:48.320
<v Speaker 3>a clap as of thunder, which seemed to go roaring

0:30:48.360 --> 0:30:51.480
<v Speaker 3>and reverberating away over the reef like the discharge of

0:30:51.520 --> 0:30:55.080
<v Speaker 3>a cannon. Not hard to imagine how that could engender

0:30:55.120 --> 0:30:56.720
<v Speaker 3>a sense of fear about this animal.

0:30:57.640 --> 0:30:58.360
<v Speaker 1>Absolutely.

0:30:58.480 --> 0:30:58.720
<v Speaker 3>Yeah.

0:30:58.920 --> 0:31:01.560
<v Speaker 1>The authors of Guide to Manta and Devil Rays of

0:31:01.600 --> 0:31:04.600
<v Speaker 1>the World, Stevens aid all they mentioned that if you're

0:31:04.600 --> 0:31:07.560
<v Speaker 1>in the water when this happens, you definitely feel it.

0:31:09.320 --> 0:31:12.080
<v Speaker 1>So yeah, Mantas and devils devil rays all engage in

0:31:12.160 --> 0:31:14.920
<v Speaker 1>leaping behavior like this, sometimes several meters out of the water,

0:31:15.480 --> 0:31:18.320
<v Speaker 1>and it's unknown exactly why they do it, which I

0:31:18.320 --> 0:31:20.240
<v Speaker 1>guess is similar to other fish which we've talked about

0:31:20.280 --> 0:31:22.920
<v Speaker 1>on the show in the past. But the predominant theories

0:31:23.320 --> 0:31:27.520
<v Speaker 1>involve either the dislodging of parasites, and as we'll discuss

0:31:27.640 --> 0:31:29.520
<v Speaker 1>and I think the next episode we do on mantas,

0:31:29.520 --> 0:31:33.240
<v Speaker 1>they geary a pretty large parasite load. The other possibility

0:31:33.360 --> 0:31:36.440
<v Speaker 1>is communication. Now the authors note that this would mean

0:31:36.480 --> 0:31:39.480
<v Speaker 1>there's much more to their social interaction than is often thought.

0:31:39.760 --> 0:31:45.520
<v Speaker 1>But the basic hypothesis here is that these different mobilid species,

0:31:45.840 --> 0:31:49.000
<v Speaker 1>especially the manta, they slap back down on the surface

0:31:49.040 --> 0:31:51.720
<v Speaker 1>of the water, and in doing so they create a

0:31:51.760 --> 0:31:55.320
<v Speaker 1>pressure wave this thunderclap that you reference, that could then

0:31:55.360 --> 0:31:59.680
<v Speaker 1>be detected by other arrays of the same species miles away.

0:32:00.440 --> 0:32:03.920
<v Speaker 1>Given that they're often observed leaping before feeding, they could

0:32:03.920 --> 0:32:06.640
<v Speaker 1>be alerting other mantas to a feeding opportunity.

0:32:06.920 --> 0:32:09.560
<v Speaker 3>Oh interesting, okay.

0:32:08.800 --> 0:32:11.240
<v Speaker 1>And why would they do that, because that's why would

0:32:11.240 --> 0:32:12.840
<v Speaker 1>you want to tell the other rays about all this

0:32:12.880 --> 0:32:15.840
<v Speaker 1>great food you just found? Well, the authors point out,

0:32:16.000 --> 0:32:20.280
<v Speaker 1>because food is plentiful, but the opportunity itself to feed

0:32:20.440 --> 0:32:23.680
<v Speaker 1>is fleeting, subject to the tides and so forth. So

0:32:23.760 --> 0:32:26.800
<v Speaker 1>the signal might be to bring in as many fellow

0:32:26.880 --> 0:32:31.000
<v Speaker 1>rays as possible to engage in group feeding strategies, which

0:32:31.000 --> 0:32:33.959
<v Speaker 1>we'll get into in a bit here that also increase

0:32:34.160 --> 0:32:37.920
<v Speaker 1>individual food halls. So you know, let's all do it

0:32:37.920 --> 0:32:41.360
<v Speaker 1>while the getting's good. Let's all feed together and we'll

0:32:41.360 --> 0:32:42.000
<v Speaker 1>all feast.

0:32:42.560 --> 0:32:44.000
<v Speaker 3>Ah interesting okay.

0:32:44.160 --> 0:32:46.760
<v Speaker 1>And then on top of that, some devil rays might

0:32:46.840 --> 0:32:50.160
<v Speaker 1>engage in breaching is a fitness signal for mating. But

0:32:50.240 --> 0:32:52.800
<v Speaker 1>again that's again that's a hypothesis based on just how

0:32:52.840 --> 0:32:55.600
<v Speaker 1>it seems to time with other things that they're doing

0:32:55.600 --> 0:32:58.560
<v Speaker 1>in the water. At any rate, as we giving back

0:32:58.560 --> 0:33:01.880
<v Speaker 1>to human sentiments, manta rays and the idea that their

0:33:01.960 --> 0:33:05.920
<v Speaker 1>vampiric death blankets and so forth, Western sentiments seem to

0:33:06.000 --> 0:33:09.000
<v Speaker 1>turn in a major way during the nineteen seventies despite

0:33:09.080 --> 0:33:13.040
<v Speaker 1>the Jaws movies, with exposure to the reality that manta

0:33:13.160 --> 0:33:16.760
<v Speaker 1>rays are anything but the devilfish of a sailor's legend.

0:33:17.680 --> 0:33:20.320
<v Speaker 1>They are the epitome of a gentle giant, indifferent or

0:33:20.320 --> 0:33:25.440
<v Speaker 1>even curious considering humans in the water, and not aggressive

0:33:25.480 --> 0:33:27.920
<v Speaker 1>at all. Again, I think the rare cases you'll find

0:33:27.960 --> 0:33:31.000
<v Speaker 1>of people being injured at all by a manta are

0:33:31.040 --> 0:33:33.320
<v Speaker 1>because they were intentionally trying to get way too close

0:33:33.360 --> 0:33:36.480
<v Speaker 1>to them, and as far as the harvesting of their

0:33:36.520 --> 0:33:40.720
<v Speaker 1>gills goes, Manta tourism has apparently been a major factor

0:33:40.840 --> 0:33:44.240
<v Speaker 1>thus far in the fight against this practice. People around

0:33:44.240 --> 0:33:46.320
<v Speaker 1>the world continue to spend a lot of money to

0:33:46.400 --> 0:33:49.800
<v Speaker 1>observe manta rays in the wild. In that twenty eighteen

0:33:49.840 --> 0:33:52.880
<v Speaker 1>guide to Devil Rays of the World Book, The authors

0:33:52.960 --> 0:33:55.600
<v Speaker 1>share that at the time of its publication, the global

0:33:55.720 --> 0:33:59.520
<v Speaker 1>estimate for direct revenue generated by manta tourism with something

0:33:59.560 --> 0:34:04.120
<v Speaker 1>like seventy three million annually, with associated tourism revenue pushing

0:34:04.120 --> 0:34:06.800
<v Speaker 1>that up to like one hundred and forty million annually.

0:34:08.200 --> 0:34:12.560
<v Speaker 1>So all of that basically translates to the realization that

0:34:13.640 --> 0:34:16.600
<v Speaker 1>if manta tourism is in the mix, a live manta

0:34:16.680 --> 0:34:19.759
<v Speaker 1>ray is worth far more than a dead one, and

0:34:19.800 --> 0:34:22.520
<v Speaker 1>so manta tourism, like a lot of marine tourism, plays

0:34:22.520 --> 0:34:26.319
<v Speaker 1>an important role in manta conservation. At the same time,

0:34:26.360 --> 0:34:29.120
<v Speaker 1>of course, there's a careful balance there, right, because you

0:34:29.160 --> 0:34:31.560
<v Speaker 1>want people to be excited about the mantas. You want

0:34:31.560 --> 0:34:33.320
<v Speaker 1>people to come out and see the manta, spend money

0:34:33.320 --> 0:34:36.480
<v Speaker 1>on the mantas and thus helping to protect them. But

0:34:36.719 --> 0:34:40.560
<v Speaker 1>also you want to avoid detrimental side effects. You know

0:34:40.880 --> 0:34:42.719
<v Speaker 1>that can occur in a number of forms. You don't

0:34:42.719 --> 0:34:46.719
<v Speaker 1>want divers and snorkelers getting way too close to the animals.

0:34:47.280 --> 0:34:50.680
<v Speaker 1>You also don't want unsustainable practices at resorts and on

0:34:50.800 --> 0:34:53.839
<v Speaker 1>liver boards and so forth. You know, the ships are

0:34:53.840 --> 0:34:57.879
<v Speaker 1>going to take divers and snorkelers out to see these creatures.

0:34:57.920 --> 0:35:00.359
<v Speaker 1>You know, you have to walk that line. I think

0:35:01.160 --> 0:35:04.520
<v Speaker 1>in my understanding is that everyone involved continues to figure

0:35:04.520 --> 0:35:17.560
<v Speaker 1>out exactly where that line falls. So at this point

0:35:17.560 --> 0:35:21.400
<v Speaker 1>I thought we'd run through some basics about manta rays

0:35:21.680 --> 0:35:26.160
<v Speaker 1>and some associated devil rays to finish out this episode.

0:35:26.480 --> 0:35:29.000
<v Speaker 1>So mantis and devil rays belong to a group collectively

0:35:29.040 --> 0:35:34.440
<v Speaker 1>known as the mobulids of the family mobili day zooming

0:35:34.440 --> 0:35:40.160
<v Speaker 1>out their rays of the order mileobataforms, which contains twelve

0:35:40.200 --> 0:35:43.359
<v Speaker 1>families three hundred and seventy species of rays, including sting

0:35:43.440 --> 0:35:47.400
<v Speaker 1>rays of various species. Moboloids are most closely related to

0:35:47.640 --> 0:35:51.040
<v Speaker 1>eagle rays and clown nose rays of this order, which

0:35:51.080 --> 0:35:54.400
<v Speaker 1>are bottom feeders. They sift for mollusks and crustaceans on

0:35:54.440 --> 0:35:59.400
<v Speaker 1>the seabed. Moboloids, however, have adapted to pelagic filter feeding

0:35:59.480 --> 0:36:03.000
<v Speaker 1>in the open water, similar to the evolutionary path we

0:36:03.080 --> 0:36:06.279
<v Speaker 1>see with like baleen whales and whale sharks. You know,

0:36:06.320 --> 0:36:09.520
<v Speaker 1>as we've been discussing, like specialize in feeding on all

0:36:09.640 --> 0:36:12.520
<v Speaker 1>the little things in the water. Eat the cloud if

0:36:12.520 --> 0:36:15.880
<v Speaker 1>you will, yes, So they use their mouths and modified

0:36:15.920 --> 0:36:20.040
<v Speaker 1>gill plates in their filter feeding. The devil ray that

0:36:20.040 --> 0:36:22.360
<v Speaker 1>we've been discussing. These are much smaller. There are a

0:36:22.360 --> 0:36:25.360
<v Speaker 1>few different varieties, with the largest I believe being the

0:36:25.520 --> 0:36:28.799
<v Speaker 1>Chilean devil ray or sickle fin devil ray. It has

0:36:28.840 --> 0:36:31.799
<v Speaker 1>a maximum disc width of eleven point two feet or

0:36:31.800 --> 0:36:34.239
<v Speaker 1>three hundred and forty centimeters, and it can weigh up

0:36:34.239 --> 0:36:36.960
<v Speaker 1>to eight hundred and eighty two pounds or four hundred kilograms.

0:36:38.280 --> 0:36:42.120
<v Speaker 1>The spinetail devil ray is also rather big. I mention

0:36:42.200 --> 0:36:46.080
<v Speaker 1>it because its scientific name is Mobula mobular, which is

0:36:46.120 --> 0:36:51.360
<v Speaker 1>always fun. And again the reef manta ray Mobula alfredi,

0:36:51.520 --> 0:36:54.479
<v Speaker 1>which sounds delicious but it's not on the menu, comes

0:36:54.480 --> 0:36:57.120
<v Speaker 1>in at a maximum disc with of fifteen feet or

0:36:57.120 --> 0:37:00.120
<v Speaker 1>four hundred and fifty centimeters and a weight of fifteen

0:37:00.200 --> 0:37:03.480
<v Speaker 1>hundred pounds or seven hundred kilograms. But then again, the

0:37:03.520 --> 0:37:08.279
<v Speaker 1>oceanic manta is the biggest. That's Mobula of bostras, and

0:37:08.320 --> 0:37:11.160
<v Speaker 1>it can reach a disc width of twenty three feet

0:37:11.239 --> 0:37:13.440
<v Speaker 1>or seven hundred centimeters and a weight of up to

0:37:13.680 --> 0:37:16.759
<v Speaker 1>forty four hundred pounds or two thousand kilograms. They are

0:37:16.800 --> 0:37:19.520
<v Speaker 1>the largest of all rays, and actually I'm to understand

0:37:19.520 --> 0:37:23.200
<v Speaker 1>the fifth largest fish. Period. There's also some argument to

0:37:23.200 --> 0:37:26.560
<v Speaker 1>be made for a possible third species of extent manta,

0:37:26.880 --> 0:37:31.239
<v Speaker 1>a Caribbean manta closely related to the oceanic manta, only

0:37:31.280 --> 0:37:34.879
<v Speaker 1>smaller now. In addition to those gill plates, the other

0:37:34.920 --> 0:37:40.080
<v Speaker 1>defining characteristics of the maboloids are their devil horns. That

0:37:40.480 --> 0:37:42.840
<v Speaker 1>certainly seems to lend to this idea that there's some

0:37:42.840 --> 0:37:45.600
<v Speaker 1>sort of evil, vampioic creature. They're like bats, and then

0:37:45.640 --> 0:37:48.160
<v Speaker 1>they have devil horns. These are not horns, of course,

0:37:48.200 --> 0:37:53.480
<v Speaker 1>these are modified cephalic fins. So the rays use these

0:37:53.520 --> 0:37:56.920
<v Speaker 1>special fins to funnel plankton into their mouths during feeding.

0:37:57.360 --> 0:38:00.360
<v Speaker 1>So the gill plates that we were just these are

0:38:00.400 --> 0:38:03.600
<v Speaker 1>supported by five pairs of gill arches. You can see

0:38:03.600 --> 0:38:07.160
<v Speaker 1>these when you see some like wide mouth photographs of

0:38:07.200 --> 0:38:11.560
<v Speaker 1>these various organisms, and each species both slightly different gill

0:38:11.600 --> 0:38:15.439
<v Speaker 1>plate structures to capture particular target prey. We were talking

0:38:15.480 --> 0:38:18.040
<v Speaker 1>about the ratio between the size of the organism and

0:38:18.080 --> 0:38:21.960
<v Speaker 1>the size of the prey. Manta rays, the biggest, have

0:38:22.160 --> 0:38:26.360
<v Speaker 1>gill plates evolved to capture much smaller plectonic prey compared

0:38:26.400 --> 0:38:29.799
<v Speaker 1>to various devil ray species. For example, they're going after

0:38:29.880 --> 0:38:33.200
<v Speaker 1>the real small stuff. Their feeding is really interesting though.

0:38:33.239 --> 0:38:35.080
<v Speaker 1>On top of this, because their bodies are you know,

0:38:35.160 --> 0:38:37.040
<v Speaker 1>we think of them as being largely flat, you know,

0:38:37.080 --> 0:38:40.640
<v Speaker 1>they're kind of flattened out, but as Stevens and co

0:38:40.680 --> 0:38:44.440
<v Speaker 1>authors point out during feeding quote, their once flattened body

0:38:44.480 --> 0:38:48.560
<v Speaker 1>and mouth becomes a giant black hole with the pectoral

0:38:48.600 --> 0:38:51.880
<v Speaker 1>fins serving as wings that power the ray through the water,

0:38:52.360 --> 0:38:54.359
<v Speaker 1>and then the gill plates do the rest. So yeah,

0:38:54.400 --> 0:38:57.919
<v Speaker 1>they expand out, they become this like giant gaping maw

0:38:58.680 --> 0:39:01.880
<v Speaker 1>to just consume all the plankton they can get. And

0:39:01.920 --> 0:39:04.680
<v Speaker 1>so that's the basic strategy. Open your mouth really wide,

0:39:05.080 --> 0:39:08.040
<v Speaker 1>use your cephalic fins to help guide the food into

0:39:08.040 --> 0:39:10.959
<v Speaker 1>the mouth, and then you know, go in a straight line,

0:39:11.120 --> 0:39:14.200
<v Speaker 1>just go straight through the food, you know, eat the cloud.

0:39:15.400 --> 0:39:19.520
<v Speaker 1>But that's just one of eight and possibly nine different

0:39:19.600 --> 0:39:23.399
<v Speaker 1>observed feeding strategies that you see in rays, with only

0:39:23.480 --> 0:39:26.840
<v Speaker 1>half of those being used at least observed in devil rays.

0:39:27.960 --> 0:39:29.600
<v Speaker 1>So I'm going to roll through these because they're they're

0:39:29.600 --> 0:39:32.880
<v Speaker 1>pretty interesting. Some are only slight variations based on the

0:39:32.920 --> 0:39:35.320
<v Speaker 1>other ones. But so first of all, you have straight

0:39:35.520 --> 0:39:39.280
<v Speaker 1>straight feeding, so this is usually horizontal, but sometimes it's vertical,

0:39:39.960 --> 0:39:42.880
<v Speaker 1>and the distance depends on prey frequency. So you have

0:39:42.920 --> 0:39:46.000
<v Speaker 1>a cloud of plankton, a big school of plankton or something. Well,

0:39:46.080 --> 0:39:48.680
<v Speaker 1>you just move straight through it, eat it, eat it up,

0:39:48.800 --> 0:39:50.640
<v Speaker 1>swallow it up, and then you do a one hundred

0:39:50.640 --> 0:39:53.200
<v Speaker 1>and eighty degree turn at the end and repeat as needed.

0:39:53.719 --> 0:39:57.560
<v Speaker 1>Number two This is manta's only apparently, and it's surface feeding.

0:39:57.680 --> 0:40:01.239
<v Speaker 1>So this is basically straight feeding, except right at the

0:40:01.239 --> 0:40:03.600
<v Speaker 1>surface of the water. All right, all right, now it

0:40:03.640 --> 0:40:07.720
<v Speaker 1>starts getting interesting. Chain feeding. So up to several dozen

0:40:07.800 --> 0:40:10.280
<v Speaker 1>individuals proceeding in a line feeding.

0:40:10.920 --> 0:40:14.120
<v Speaker 3>Oh, it's funny that that would actually work. I would

0:40:14.120 --> 0:40:16.160
<v Speaker 3>imagine the further back you are in the line, maybe

0:40:16.160 --> 0:40:19.160
<v Speaker 3>you're not getting anything. But no, I wonder if going

0:40:19.200 --> 0:40:21.440
<v Speaker 3>through a head kind of creates a vortex, maybe that

0:40:21.600 --> 0:40:22.839
<v Speaker 3>sucks some more things in.

0:40:23.440 --> 0:40:25.879
<v Speaker 1>I think that that might be what's happening. And also

0:40:25.920 --> 0:40:28.319
<v Speaker 1>we just have to remember we're dealing with an abundance

0:40:28.400 --> 0:40:32.000
<v Speaker 1>of food here, and this ties in. This is exactly

0:40:32.080 --> 0:40:34.560
<v Speaker 1>and this is an example of the social feeding technique

0:40:34.800 --> 0:40:40.680
<v Speaker 1>group feeding technique that they might hypothetically be calling other

0:40:40.760 --> 0:40:45.239
<v Speaker 1>mantas to engage in. Okay of next piggyback feeding. So

0:40:45.400 --> 0:40:48.320
<v Speaker 1>this is manta's only and it's actually only been observed

0:40:48.320 --> 0:40:51.280
<v Speaker 1>in reef mantas. So you'll have a smaller manta, usually

0:40:51.280 --> 0:40:55.760
<v Speaker 1>a male, and it finds a larger usually female, matches

0:40:55.760 --> 0:40:58.160
<v Speaker 1>her pace, and it's like stacked on top of her

0:40:58.600 --> 0:41:01.400
<v Speaker 1>and feeds as she feeding in a straight line. And

0:41:01.440 --> 0:41:04.160
<v Speaker 1>sometimes you'll get additional mantas stacked on top of that

0:41:04.520 --> 0:41:07.920
<v Speaker 1>until the bottom most manta swims off and displaces the

0:41:07.920 --> 0:41:10.520
<v Speaker 1>whole stack. All right, here's where it gets a little

0:41:10.520 --> 0:41:13.200
<v Speaker 1>fancy summer salt feeding. So this is where they're going

0:41:13.200 --> 0:41:15.359
<v Speaker 1>in a straight line, and then they'll do a three

0:41:15.440 --> 0:41:17.920
<v Speaker 1>hundred and sixty degree loop in the water while feeding,

0:41:18.400 --> 0:41:21.080
<v Speaker 1>usually just one or two loops out of straight feeding,

0:41:21.120 --> 0:41:25.960
<v Speaker 1>but they might do several dozen continuous summer salts, depending

0:41:25.960 --> 0:41:28.040
<v Speaker 1>I guess on how it's going for them and with

0:41:28.120 --> 0:41:30.719
<v Speaker 1>the plankton. This next one, though, this is where it gets.

0:41:30.880 --> 0:41:34.759
<v Speaker 1>This one gets crazy cyclone feeding. What Yeah, So this

0:41:34.840 --> 0:41:37.319
<v Speaker 1>is apparently reef mantas only at least as far as

0:41:37.360 --> 0:41:40.440
<v Speaker 1>observations go. And it begins as just a line of

0:41:40.560 --> 0:41:46.320
<v Speaker 1>chain feeding straight feeders. But then you know something, something changes.

0:41:46.840 --> 0:41:50.160
<v Speaker 1>You know, maybe it's in just how much planked in

0:41:50.160 --> 0:41:53.600
<v Speaker 1>they're encountering, but the chain loops back on itself to

0:41:53.640 --> 0:41:56.080
<v Speaker 1>form a circle. And now we have a circle of

0:41:56.120 --> 0:42:00.440
<v Speaker 1>mantas feeding, and then more mantas begin to form, to

0:42:00.520 --> 0:42:03.799
<v Speaker 1>join in and become part of the formation, and so

0:42:03.840 --> 0:42:07.880
<v Speaker 1>we end up with a counterclockwise cyclone that might ultimately

0:42:08.040 --> 0:42:11.120
<v Speaker 1>entail one hundred and fifty individuals and it might even

0:42:11.200 --> 0:42:12.240
<v Speaker 1>last up to an hour.

0:42:12.680 --> 0:42:13.160
<v Speaker 3>Wow.

0:42:13.480 --> 0:42:16.080
<v Speaker 1>And again the idea here seems to be that these

0:42:17.680 --> 0:42:21.040
<v Speaker 1>group feeding scenarios, when they're able to pull them together

0:42:21.320 --> 0:42:25.240
<v Speaker 1>like it actually results in a bounty for everyone involved.

0:42:26.280 --> 0:42:28.839
<v Speaker 1>On top of this, we have sideways feeding. This is

0:42:29.080 --> 0:42:31.440
<v Speaker 1>maybe not that fancy. It's just the manta ray doing

0:42:32.880 --> 0:42:36.319
<v Speaker 1>chain feeding or straight feeding, but on their sides. Then

0:42:36.360 --> 0:42:38.160
<v Speaker 1>we have bottom feeding, which I guess you can think

0:42:38.160 --> 0:42:40.560
<v Speaker 1>of as a return to form feeding along the bottom

0:42:40.640 --> 0:42:43.480
<v Speaker 1>like some of the other rays that they're more distantly

0:42:43.520 --> 0:42:49.279
<v Speaker 1>related to. And then a ninth possible feeding technique that

0:42:49.360 --> 0:42:52.319
<v Speaker 1>the authors here observe in devil rays is what they

0:42:52.360 --> 0:42:56.360
<v Speaker 1>call lunge feeding, and that's rapid feeding acceleration into dense

0:42:56.360 --> 0:42:59.080
<v Speaker 1>schools of prey. Again, this would I think only be

0:42:59.160 --> 0:43:01.759
<v Speaker 1>devil rays which are going to be you know, the

0:43:01.800 --> 0:43:06.319
<v Speaker 1>smaller of the species involved here. So mangolods first pop

0:43:06.440 --> 0:43:09.120
<v Speaker 1>up in the fossil records some twenty eight million years

0:43:09.120 --> 0:43:13.840
<v Speaker 1>ago during the Middle Oligocene epoch, So according to stevens

0:43:13.840 --> 0:43:17.680
<v Speaker 1>at All, they're among the most recently evolved of the

0:43:17.719 --> 0:43:22.120
<v Speaker 1>elasmo Bronx. This includes all sharks and battle morphs, so

0:43:22.239 --> 0:43:25.360
<v Speaker 1>you know sharks, rays, and so forth, the various cartilage

0:43:25.960 --> 0:43:31.080
<v Speaker 1>fish swimmers of the oceans. They've evolved to, of course

0:43:31.120 --> 0:43:34.640
<v Speaker 1>become exceptional open water swimmers with sufficient speed bursts of

0:43:34.719 --> 0:43:36.720
<v Speaker 1>up to I believe twenty miles per hour or thirty

0:43:36.719 --> 0:43:41.359
<v Speaker 1>three kilometers per hour. And this was interesting, and I

0:43:41.400 --> 0:43:46.200
<v Speaker 1>have trouble exactly understanding this how this works, but I

0:43:46.239 --> 0:43:49.480
<v Speaker 1>totally believe it. They say that they're flattened shapes apparently

0:43:49.520 --> 0:43:53.200
<v Speaker 1>make it more difficult for predators to bite onto them,

0:43:53.280 --> 0:43:56.799
<v Speaker 1>hold onto them, or certainly to target vital areas that way.

0:43:57.640 --> 0:44:00.040
<v Speaker 3>Okay, yeah, I wonder how that would work, because I

0:44:00.040 --> 0:44:02.680
<v Speaker 3>would imagine, you know, if you're kind of cookie shaped,

0:44:02.719 --> 0:44:04.680
<v Speaker 3>if you're flat, it might not be that hard to

0:44:04.719 --> 0:44:07.440
<v Speaker 3>take a bite of you. But I wonder if doing

0:44:07.480 --> 0:44:10.520
<v Speaker 3>that you're maybe able to keep your most vital parts

0:44:10.600 --> 0:44:13.239
<v Speaker 3>kind of central So if something does bite you, it

0:44:13.280 --> 0:44:14.840
<v Speaker 3>gets a less vital part of you.

0:44:15.760 --> 0:44:18.719
<v Speaker 1>Yeah, like maybe you're more it's more possible that you

0:44:18.760 --> 0:44:22.239
<v Speaker 1>get a bite of a fin or wing if you will. Yeah,

0:44:23.160 --> 0:44:25.800
<v Speaker 1>this is something they get in get into in the book.

0:44:26.239 --> 0:44:30.880
<v Speaker 1>They do rapidly heal from serious injuries. The book displays

0:44:32.160 --> 0:44:36.080
<v Speaker 1>a few different rather dramatic examples via photographs of rays

0:44:36.320 --> 0:44:39.320
<v Speaker 1>with clear bites taken out of their fins, out of

0:44:39.320 --> 0:44:43.880
<v Speaker 1>their wings, and then a subsequent photo showing how those

0:44:44.280 --> 0:44:49.520
<v Speaker 1>like massive bites have mostly but you know, imperfectly healed

0:44:49.840 --> 0:44:53.240
<v Speaker 1>at a later observation date. And I mentioned this already,

0:44:53.280 --> 0:44:56.600
<v Speaker 1>but predation rates also seem to depend on particular communities

0:44:56.600 --> 0:44:59.319
<v Speaker 1>and environments. So, for example, the authors of this book

0:44:59.360 --> 0:45:02.840
<v Speaker 1>point out that mantas and Mozambique display far more evidence

0:45:02.840 --> 0:45:05.759
<v Speaker 1>of shark attacks compared to those in the Maldives, where

0:45:05.840 --> 0:45:08.760
<v Speaker 1>less than fifteen percent of mantas show evidence of bites.

0:45:09.200 --> 0:45:12.000
<v Speaker 3>Yeah. I think I was specifically reading about off the

0:45:12.040 --> 0:45:15.200
<v Speaker 3>coast of Mozambique, where there was common evidence that mantis

0:45:15.280 --> 0:45:17.960
<v Speaker 3>had been bitten by sharks but had survived the encounter

0:45:18.080 --> 0:45:20.080
<v Speaker 3>because they grew up in the wounds healed.

0:45:20.320 --> 0:45:24.239
<v Speaker 1>Yeah, and the healing of those wounds also involves some

0:45:24.320 --> 0:45:27.279
<v Speaker 1>of the cleaning fish, which we'll get back to in

0:45:27.320 --> 0:45:30.520
<v Speaker 1>the next episode we do on mantas. All right, well,

0:45:30.520 --> 0:45:32.920
<v Speaker 1>we're going to go and close this episode of Stuff

0:45:32.920 --> 0:45:34.319
<v Speaker 1>to Blow Your Mind, but we're going to be back.

0:45:34.320 --> 0:45:35.680
<v Speaker 1>I don't think it's going to be this week. I

0:45:35.680 --> 0:45:37.239
<v Speaker 1>think it's going to be next week based on the

0:45:37.239 --> 0:45:40.640
<v Speaker 1>way the schedules coming together. But we'll be back with

0:45:41.000 --> 0:45:44.239
<v Speaker 1>at least one more episode on the Manta Ray. If

0:45:44.280 --> 0:45:46.200
<v Speaker 1>not a couple, we'll just see how it comes together.

0:45:46.719 --> 0:45:48.880
<v Speaker 1>Just a reminder for everyone out there, The Stuff to

0:45:48.880 --> 0:45:51.560
<v Speaker 1>Blow Your Mind is a science and culture podcast with

0:45:51.560 --> 0:45:54.880
<v Speaker 1>core episodes on Tuesdays and Thursdays. On Fridays, However, we

0:45:54.920 --> 0:45:56.920
<v Speaker 1>set aside most serious concerns to just talk about a

0:45:56.960 --> 0:46:00.400
<v Speaker 1>weird film on Weird House Cinema. Wherever you get the podcast,

0:46:00.480 --> 0:46:02.759
<v Speaker 1>we just ask the rate and review us. Give us

0:46:02.760 --> 0:46:04.880
<v Speaker 1>a few stars. That helps us out. And if you

0:46:04.880 --> 0:46:06.839
<v Speaker 1>want to follow us on social media, let's see. We're

0:46:06.880 --> 0:46:10.880
<v Speaker 1>stbim Podcasts on Instagram. That's our more recent Instagram account

0:46:10.920 --> 0:46:13.480
<v Speaker 1>that we're still trying to build back up. Let's see.

0:46:13.480 --> 0:46:15.759
<v Speaker 1>If you want to follow a weird House Cinema that

0:46:16.000 --> 0:46:19.880
<v Speaker 1>we are on letterboxed. We are weird House on that platform,

0:46:20.280 --> 0:46:22.760
<v Speaker 1>and uh yeah you can otherwise just get the podcast

0:46:22.800 --> 0:46:25.040
<v Speaker 1>wherever you get your episodes of podcasts.

0:46:25.320 --> 0:46:28.960
<v Speaker 3>Huge thanks as always to our excellent audio producer JJ Posway.

0:46:29.320 --> 0:46:30.839
<v Speaker 3>If you would like to get in touch with us

0:46:30.840 --> 0:46:33.320
<v Speaker 3>with feedback on this episode or any other, to suggest

0:46:33.320 --> 0:46:35.319
<v Speaker 3>a topic for the future, or just to say hello,

0:46:35.440 --> 0:46:38.200
<v Speaker 3>you can email us at contact stuff to Blow your

0:46:38.200 --> 0:46:44.960
<v Speaker 3>Mind dot com.

0:46:46.640 --> 0:46:49.560
<v Speaker 2>Stuff to Blow Your Mind is production of iHeartRadio. For

0:46:49.640 --> 0:46:52.440
<v Speaker 2>more podcasts from my heart Radio, visit the iHeartRadio app,

0:46:52.560 --> 0:46:55.280
<v Speaker 2>Apple Podcasts, or wherever you're listening to your favorite shows

0:47:06.520 --> 0:47:06.560
<v Speaker 2>or