One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
The Pistol Shrimp can snap its claws together to create a sound of 218 decibels, louder than as supersonic jet at full speed. It only lasts for 1 millisecond. The snapping action also creates a bubble that is greater than 5000 Kelvin, close to the surface temperature of the sun.
21
Early American humans hunted car-size armadillos and used their shells for houses.
12
Sloths take two weeks to digest their food.
243
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
Mosquitoes don't just bite you, they also pee on you.
11
A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
13