Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
It's possible to train your cat to use the toilet as a litter box and even flush afterwards.
109
Cats and dogs can hear ultrasound.
350
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
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
Leonardo Da Vinci loved animals so much that he used to buy caged animals at the market just to set them free.
57