A group of kittens is called a "kindle".
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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A koi fish, named "Hanako", was owned by several individuals over many years and lived to be 226 years old, dying in 1977.
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Sloths take two weeks to digest their food.
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Rex the German Shepherd was a rescue dog with a bad temper. He refused to be fed by humans and would attack strangers, but he’s a changed dog after falling in love with Geraldine the goose!
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The first known contraceptive was crocodile dung, used by Egyptians in 2000 B.C.
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