Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
In 1949, an official boxing match between a bear and a man was held. The bear won.
41
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
George was the world's largest dog who weighed 233 pounds, stood at 43 inches tall from paw to shoulder, and ate 180 pounds of food a month.
7
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
The Savannah is the largest domestic cat breed. It resembles a small leopard and behaves like a dog. They can grow up to 40 lbs, have an eight foot vertical jump, and can be trained to walk on a leash and play fetch.
17
The Basenji dog is the only dog that is not able to bark.
4