Cows can sleep standing up, but they can only dream lying down.
745
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 zoo in China gave a gay penguin couple the opportunity to raise a chick.
11
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
Sharks, like other fish, have their reproductive organs in their chests.
248
Cows as they are today never existed in the wild and were domesticated from aurochs some 10,500 years ago.
6