When cats are happy, they may squeeze their eyes shut.
10
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
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
A dairy cow can produce more milk when listening to music.
446
In Australia, there are spiders big enough to eat snakes.
20
Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
20