Dogs sometimes fake being sick to get attention.
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Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
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One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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Cows can sleep standing up, but they can only dream lying down.
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In 2011, a male tiger in India adopted a litter of orphaned cubs, taking on the role of ‘mother’. Wildlife officials say such behavior had never been observed before.
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