Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
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Cows can sleep standing up, but they can only dream lying down.
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A dork is a whale's penis.
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Urechis unicinctus is a species of marine spoon worm that is widely referred to as the ‘penis fish’.
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Some older/less efficient worker termites will develop 'backpacks' of toxic chemicals that explode when the termite is threatened. They are essentially used as suicide bombers when the colony is being attacked.
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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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