Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
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The chlorine smell in swimming pools is accentuated by the chemical's reaction with impurities (like poop.)
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There's a phone app called RoboRoach that allows you to remotely control a cockroach through a chip that you to manually implant into the unwitting critter.
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Most of the dust underneath your bed is actually your own dead skin.
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If a vampire bat goes 2 days without drinking blood, they can die. However, well fed female bats will puke up blood and share it with other bats that they like in exchange for grooming.
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