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
It has been estimated that a bite from a grizzly bear can crush a bowling ball.
11
Leonardo Da Vinci loved animals so much that he used to buy caged animals at the market just to set them free.
57
Sloths take two weeks to digest their food.
243
The colossal squid has the largest eyes in the world.
4
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
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
The ancestor of all domestic cats is the African Wild Cat which still exists today.
12