A spider's silk is stronger than steel.
52
If a vampire bat goes 2 days without drinking blood, they can die. However, well fed female bats will puke up blood and share it with other bats that they like in exchange for grooming.
13
Koala Bears are not bears.
34
What you find when you shave the striped fur off of a tiger? Striped skin.
163
A female ferret will die if it goes into heat and cannot find a mate.
143
There is a sea snail that wears a suit of iron plated armor. It is the only known animal to use iron sulphide as skeletal material.
9
There is a tiger named Kenny who is the only known tiger to have downs syndrome.
10