There are approximately three chickens for every human on Earth.
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The first known contraceptive was crocodile dung, used by Egyptians in 2000 B.C.
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The reindeer is the only mammal that can see UV light.
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Some lizards, in which the tail is a major storage organ for accumulating reserves, will return to a dropped tail after the threat has passed, and will eat it to recover part of the sacrificed supplies.
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Lobsters have blue blood.
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