Cows can sleep standing up, but they can only dream lying down.
745
Condoms were originally made of animal intestines or linen.
347
Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
2
Alligators can live up to 100 years.
337
There's a rare breed of pig that looks like a sheep.
14
The difference between antlers and horns is that antlers are shed each year and are made of bone while horns are kept for life and are made of living tissue and bone with a sheath that is very similar to human finger nails.
10