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
A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
13
On some poorly researched trivia lists it is stated as a fact that a pregnant goldfish is called a twit. This is not true as goldfish lay eggs.
71
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
Cows as they are today never existed in the wild and were domesticated from aurochs some 10,500 years ago.
6
Early American humans hunted car-size armadillos and used their shells for houses.
12