When cats are happy, they may squeeze their eyes shut.
10
Hummingbirds can weigh less than a penny!
12
The world's smartest pig, owned by a mathematics teacher in Madison, WI, memorized the multiplication tables up to 12.
264
Some lizards, in which the tail is a major storage organ for accumulating reserves, will return to a dropped tail after the threat has passed, and will eat it to recover part of the sacrificed supplies.
13
A giraffe can clean its ears with its 21-inch tongue!
31
Jumping fleas can accelerate 50 times faster than the space shuttle.
218
A group of frogs is called an army.
51
An eagle can attack, kill, and carry away an animal as large as a small deer.
38