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
The first known contraceptive was crocodile dung, used by Egyptians in 2000 B.C.
79
Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
There is a sea snail that wears a suit of iron plated armor. It is the only known animal to use iron sulphide as skeletal material.
9
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
A koi fish, named "Hanako", was owned by several individuals over many years and lived to be 226 years old, dying in 1977.
6
A cow produces around 200,000 glasses of milk in her lifetime.
373