Cows as they are today never existed in the wild and were domesticated from aurochs some 10,500 years ago.
6
Cats sleep for 70% of their lives.
8
When cats are happy, they may squeeze their eyes shut.
10
The first known contraceptive was crocodile dung, used by Egyptians in 2000 B.C.
79
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Crows living in some urban areas drop nuts into traffic to let the passing cars crush them, then they wait for the red lights to stop the traffic so they can grab and eat it.
17
Denmark has twice as many pigs as there are people.
66