There are approximately three chickens for every human on Earth.
13
The ancestor of all domestic cats is the African Wild Cat which still exists today.
12
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
34
Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
2
The Basenji dog is the only dog that is not able to bark.
4