Condoms were originally made of animal intestines or linen.
347
Skittles and jellybeans contain crushed insect cocoons which are used to coat the candies to give them that special shine.
9
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
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.
13
The chlorine smell in swimming pools is accentuated by the chemical's reaction with impurities (like poop.)
7