Lurch, a Watusi bull, had the largest horns in the world.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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In 1955, the citizens of São Paulo were so upset with their government that they elected a rhinoceros named Cacareco (meaning rubbish) to the city council in protest, with over 100,000 votes.
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Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
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The ancestor of all domestic cats is the African Wild Cat which still exists today.
12
When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
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Mosquitoes prefer certain blood types, and people with the “O” blood type are more likely to get bitten.
12
Female kangaroos have three vaginas.
2