Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
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
When dragonflies mate, their tails form a love heart.
22
Gorillas can catch human colds and other illnesses.
205
Ants have tiny magnetic compasses in their antennae which help them navigate.
9
It's possible to train your cat to use the toilet as a litter box and even flush afterwards.
109
The oldest known animal in the world was 'Ming' the 405 year old clam, discovered in 2007.
492