Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
20
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 cat rubs against people not only to be affectionate but also to mark out its territory with scent glands around its face. The tail area and paws also carry the cat's scent.
293
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
A 42-foot sperm whale has about 7 tons of oil in it.
209