A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
An ostrich's eye is bigger than its brain.
32
Ducks will only lay eggs early in the morning.
36
The most expensive cow in the world was sold $1.3 million.
160
A crocodile cannot stick out its tongue.
1k
There is a species of clam that can grow up to four feet long and weigh up to 500 pounds.
89
Squirrels forget where they hide about half of their nuts.
698
A group of kangaroos is called a mob.
28