Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
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Alligator snapping turtles can live for over 150 years. Scientists know this because some of the turtles had musket balls in their stomachs.
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There is a sea snail that wears a suit of iron plated armor. It is the only known animal to use iron sulphide as skeletal material.
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It has been estimated that a bite from a grizzly bear can crush a bowling ball.
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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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Mosquitoes don't just bite you, they also pee on you.
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