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Humans can't hear infrasound, which scientists define as any sound pitched below 20 hertz to as low as 2 hertz. But it turns out that some animals, including elephants, hippos, giraffes, whales, and alligators, have acute infrasound hearing.
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We've all heard them: the tales of dogs barking before the big earthquake hit; wildlife behaving strangely before the big hurricane; earthworms pouring out of the ground just before the big flood strikes. Tall tales ... or true?
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In interviews with scientists and eyewitnesses, NATURE probes the evidence that some animals may have senses that allow them to predict impending natural disasters long before we can.
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Major corporate support for Nature is provided by SC Johnson, Canon, CPB.
