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
Tigers can see 6 times better at night than humans.
305
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
25
When you shave a guinea pig it looks like a little hippo.
19