The Basenji dog is the only dog that is not able to bark.
4
In 1949, an official boxing match between a bear and a man was held. The bear won.
41
Unsinkable Sam (nickname of a German ship's cat) who served on 3 warships, one German, two British, all sank in action. The cat survived each sinking, floating away on wooden planks to rescue.
19
Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
Lobsters have blue blood.
476
In Australia, there are spiders big enough to eat snakes.
20