In the last 4000 years, no new animals have been domesticated. See more

A cow gives nearly 200,000 glasses of milk in her lifetime. See more

A giraffe can clean its ears with its 21-inch tongue. See more

A tuna called the 'Blue Fin' can be sold for over $20,000 around the world. See more

A rat can last longer without water than a camel. See more

A rat can last longer without water than a camel can. See more

The hairs on a polar bear are not white, but clear. They reflect light, so they appear white. See more

An octopus can change its shape and color to blend in with its surroundings. See more

Starfish haven't got brains. See more