The first known contraceptive was crocodile dung, used by Egyptians in 2000 B.C.
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When cats are happy, they may squeeze their eyes shut.
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Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
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Vanilla flavoring is sometimes made with an ingredient from beaver pee.
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Sergeant Stubby was the only war dog to be promoted to sergeant through combat in WWI. He saved his regiment from surprise mustard gas attacks, found and comforted the wounded, and even once caught a German spy by the seat of his pants, holding him there until American Soldiers found him.
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