Sheep, goats, octopuses, and toads have rectangular pupils.
7
Dolphins have names for one another.
18
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
Only 3% of bird species have penises.
0
When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20
The oldest known animal in the world was 'Ming' the 405 year old clam, discovered in 2007.
492
The ancestor of all domestic cats is the African Wild Cat which still exists today.
12