Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
There's a young hippo and a 130+ year old tortoise in a Kenyan wildlife preserve who are best friends and they even sleep and play together.
40
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
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
A tortoise named Adwaita lived to 255 years old. To put it into perspective, he was born before the United States of America existed and his death was announced on CNN (1750-2006).
12
Dolphins have names for one another.
18
Cows as they are today never existed in the wild and were domesticated from aurochs some 10,500 years ago.
6