Dogs have been man's pet for over 14,000 years.
224
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Dire wolves actually existed, living up to 10,000 years ago before going extinct.
10
The Basenji dog is the only dog that is not able to bark.
4
Cows as they are today never existed in the wild and were domesticated from aurochs some 10,500 years ago.
6
The reindeer is the only mammal that can see UV light.
17