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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Early American humans hunted car-size armadillos and used their shells for houses.
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Mosquitoes don't just bite you, they also pee on you.
11
Jaguars frequently get high by eating hallucinogenic roots, which also increases their senses for hunting.
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When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20
The Basenji dog is the only dog that is not able to bark.
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