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Speaker 1: Welcome to brain stuff from how stuff works. Hey, brain stuff,

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Speaker 1: it's me Christian Sager. Have you heard about how pets

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Speaker 1: sometimes go missing just before an earthquake hits? Or how

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Speaker 1: about in two thousand four when a tsunami hit Southeast

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Speaker 1: Asia and killed more than two hundred thousand people but

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Speaker 1: almost no wild animals. And did you know that dogs, elephants, antelopes, bats,

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Speaker 1: and even flamingos fled the scene before the wave hit,

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Speaker 1: even flamingos. Many people assume it's because animals are more

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Speaker 1: attuned to their environment than we are. Others, like the

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Speaker 1: United States Geological Survey Agency, say there's no connection between

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Speaker 1: animal behavior and natural disasters. But if there were, wouldn't

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Speaker 1: it warrant a closer look. Think of the impact it

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Speaker 1: would have if we knew animals could predict dangerous natural events. Now,

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Speaker 1: the majority of researchers looking into this aren't claiming animals

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Speaker 1: have a sixth sense or anything supernatural going on. What

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Speaker 1: they do think is that animals make greater use of

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Speaker 1: their senses than we do. Using these, they react to

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Speaker 1: environmental signals that we stupid humans just don't notice. Of course,

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Speaker 1: different species have varying sensitivity to these fluctuations, and most

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Speaker 1: evidence is anecdotal. But if animals are aware of natural disasters,

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Speaker 1: here's how they know when troubles are coming. Most likely,

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Speaker 1: animals can hear sounds that we can't, especially the infrasonic

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Speaker 1: low pitched vibrations made by earthquakes, storms, volcanoes, avalanches, and oceans.

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Speaker 1: In some studies, researchers found that these sounds, usually lower

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Speaker 1: than twenty hurts, make humans uneasy and even nauseous, So

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Speaker 1: with their greater spectrum of hearing, it makes sense that

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Speaker 1: animals would perceive these before us as unsettling. If you

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Speaker 1: heard a deep rumbling sound coming at you from a

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Speaker 1: wide angle, what would you do? Did you hang out

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Speaker 1: and make sandwiches? Or would you run for your life.

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Speaker 1: One study that supports this infrasonic hearing theory happened when

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Speaker 1: Stanley Corn was studying whether dogs suffered from seasonal effective disorder.

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Speaker 1: One day, many of his one hundred and ninety three

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Speaker 1: test dogs suddenly flipped out. Corn could not figure out

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Speaker 1: what was going on until a day later, when he

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Speaker 1: noticed that an earthquake struck nearby at a six point

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Speaker 1: eight on the Richter scale. After reviewing the results, corn

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Speaker 1: found that fourteen of the animals had hearing impairments, and

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Speaker 1: these were the dogs that didn't become anxious before the earthquakes.

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Speaker 1: Looking further, he noticed that dogs with floppy ears were

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Speaker 1: less likely to be agitated than those with perky, open ears,

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Speaker 1: So it looks like the strength of their sense of

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Speaker 1: hearing was what attuned the dogs to the earthquakes low tones.

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Speaker 1: Another theory is that through their sense of touch, animals

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Speaker 1: can feel vibrations through the ground or sense shifts in

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Speaker 1: air or water pressure. Hurricanes are known to decrease such pressures,

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Speaker 1: and scientists have observed that sharks change their behavior when

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Speaker 1: storms cause pressure drops, swimming to deeper waters where they'll

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Speaker 1: be protected. Birds and insects also seek cover when this happens.

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Speaker 1: They're also sensitive to something called ray lay waves. These

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Speaker 1: are minute vibrations that travel through the Earth's crust. These

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Speaker 1: waves are inaudible and travel ten times the speed of sound,

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Speaker 1: which would explain why some animals since disaster coming sometimes

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Speaker 1: days before it strikes. Now that you've heard the theories,

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Speaker 1: do you think we should make safety decisions based on

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Speaker 1: the behavior of our local animals. Well, China did in

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Speaker 1: nineteen when they evacuated a city before an earthquake hit

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Speaker 1: after its animals showed signs of anxiety that was estimated

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Speaker 1: to have saved thousands of lives. Check out the brainstff

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Speaker 1: channel on YouTube, and for more on this and thousands

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Speaker 1: of other topics, visit how stuff works dot com