A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Jellyfish as a species are actually older than dinosaurs and sharks.
383
Some older/less efficient worker termites will develop 'backpacks' of toxic chemicals that explode when the termite is threatened. They are essentially used as suicide bombers when the colony is being attacked.
8
Dogs sometimes fake being sick to get attention.
26
In 1949, an official boxing match between a bear and a man was held. The bear won.
41
Sharks, like other fish, have their reproductive organs in their chests.
248