A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
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
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
25
A giraffe's kick is so powerful that it can decapitate a lion.
216
There was a bear called Wojtek who was adopted by Polish soldiers during WW2. It carried ammunition, wrestled with soldiers, and drank beer.
40
Camels and llamas can cross breed. The offspring is called a ‘Cama’.
10
The first known contraceptive was crocodile dung, used by Egyptians in 2000 B.C.
79