When cats are happy, they may squeeze their eyes shut.
10
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
Using a remote-controlled camera, biologists caught dolphins getting high by sucking on puffer fish. They were even caught passing the puffer fish around.
23
In 1949, an official boxing match between a bear and a man was held. The bear won.
41
Rattlesnake mating sessions have been known to last more than 22 hours.
232
When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132