There are approximately three chickens for every human on Earth.
13
Cats and dogs can hear ultrasound.
350
There's a rare breed of pig that looks like a sheep.
14
Whales and dolphins can't taste anything other than salt.
11
Cows can sleep standing up, but they can only dream lying down.
745
A zoo in China gave a gay penguin couple the opportunity to raise a chick.
11
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12