Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
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Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
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Cows can sleep standing up, but they can only dream lying down.
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When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
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When Koko, the gorilla famous for knowing sign language, was asked where gorillas go after death, she responded by signing “Comfortable hole, bye.”
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