A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
The oldest recorded elephant lived for 82 years.
213
The Basenji dog is the only dog that is not able to bark.
4
Some lizards, in which the tail is a major storage organ for accumulating reserves, will return to a dropped tail after the threat has passed, and will eat it to recover part of the sacrificed supplies.
13
Cats lose almost as much fluid in the saliva while grooming themselves as they do through urination!
205
In 1949, an official boxing match between a bear and a man was held. The bear won.
41