Cows can sleep standing up, but they can only dream lying down.
745
Cows as they are today never existed in the wild and were domesticated from aurochs some 10,500 years ago.
6
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
Honeypot ants are a unique insect that use their own bodies as living storage pots of honey.
4
An alligator can go through 2,000 to 3,000 teeth in a lifetime.
268
Vanilla flavoring is sometimes made with an ingredient from beaver pee.
82
Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
2