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.
10
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
Your ears secrete more earwax when you are afraid than when you aren't.
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The chlorine smell in swimming pools is accentuated by the chemical's reaction with impurities (like poop.)
7
A banana slug can be 6-8 inches and their erect penis can be just as long. Also, their penises emerge from their heads. After sex, banana slugs eat each others penises.
17
If you see an ingredients list that includes carmine, cochineal extract or natural red 4, the product contains crushed up bugs.
8