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
It has been calculated that a single breath from a mature blue whale can inflate up to 2,000 balloons.
492
When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
25
A cat rubs against people not only to be affectionate but also to mark out its territory with scent glands around its face. The tail area and paws also carry the cat's scent.
293
Sharks have been on the planet longer than trees.
14
Sheep, goats, octopuses, and toads have rectangular pupils.
7
Sloths take two weeks to digest their food.
243