One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
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Macaques monkeys in Japan learned to steal purses and wallets, take out the coins, and use them to buy drinks and snacks from vending machines.
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Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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Nervous dogs wag their tails to the left, and happy dogs to the right (from the dog’s point of view) – and fellow canines pick up on this lop-sided tail language.
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