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
The cat brain weighs about 30g.
167
In Australia, there are spiders big enough to eat snakes.
20
The ancestor of all domestic cats is the African Wild Cat which still exists today.
12
Ants have tiny magnetic compasses in their antennae which help them navigate.
9
Sheep, goats, octopuses, and toads have rectangular pupils.
7