When cats are happy, they may squeeze their eyes shut.
10
Gorillas can catch human colds and other illnesses.
205
Cows as they are today never existed in the wild and were domesticated from aurochs some 10,500 years ago.
6
George was the world's largest dog who weighed 233 pounds, stood at 43 inches tall from paw to shoulder, and ate 180 pounds of food a month.
7
Alligator snapping turtles can live for over 150 years. Scientists know this because some of the turtles had musket balls in their stomachs.
271
Jumping fleas can accelerate 50 times faster than the space shuttle.
218