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
Baks the blind boxer has a seeing eye goose named Buttons; a four-year-old goose who leads the pup around everywhere either by hanging onto him with her neck, or by honking to tell him which way to go.
16
The first known contraceptive was crocodile dung, used by Egyptians in 2000 B.C.
79
Penguins have a gland above their eye that turns saltwater into freshwater.
12
Cows can sleep standing up, but they can only dream lying down.
745
Tigers can see 6 times better at night than humans.
305