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
Your ears secrete more earwax when you are afraid than when you aren't.
229
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
Most of the dust underneath your bed is actually your own dead skin.
251
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6