When cats are happy, they may squeeze their eyes shut.
10
Only 3% of bird species have penises.
0
During World War 1, starving wolves amassed in such great numbers that Germans and Russians had a temporary cease fire to fight off the wolf attacks.
45
Squirrels will sometimes adopt orphaned baby squirrels that they’re related to.
12
Vampire bats adopt orphans, and are one of the few mammals known to risk their own lives to share food with less fortunate roost-mates.
402
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