Only 3% of bird species have penises.
0
Frogs cannot swallow without blinking.
41
Snails breathe through their feet.
34
The lifespan of mammals is about 1 and a half billion heartbeats.
127
Some lizards, in which the tail is a major storage organ for accumulating reserves, will return to a dropped tail after the threat has passed, and will eat it to recover part of the sacrificed supplies.
13
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
All bonobo chimpanzees are bisexual!
29
