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
Cats recognise the voice of their owner, but never evolved to care.
22
The first known contraceptive was crocodile dung, used by Egyptians in 2000 B.C.
79
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
Condoms were originally made of animal intestines or linen.
347
Bats sleep 18-20 hours per day.
5