Only 3% of bird species have penises.
0
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
Sheep, goats, octopuses, and toads have rectangular pupils.
7
Squirrels forget where they hide about half of their nuts.
698
In Australia, there are spiders big enough to eat snakes.
20
It's possible to train your cat to use the toilet as a litter box and even flush afterwards.
109
When you shave a guinea pig it looks like a little hippo.
19