Bats sleep 18-20 hours per day.
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Female kangaroos have three vaginas.
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Lobsters have blue blood.
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Cats and dogs can hear ultrasound.
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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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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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