A group of kittens is called a "kindle".
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A tortoise named Adwaita lived to 255 years old. To put it into perspective, he was born before the United States of America existed and his death was announced on CNN (1750-2006).
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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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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A cat rubs against people not only to be affectionate but also to mark out its territory with scent glands around its face. The tail area and paws also carry the cat's scent.
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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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Female kangaroos have three vaginas.
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Queen ants have one of the longest life-spans of any known insect - typically up to 30 years. Western harvester ant queens can live up to 40 years!
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