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
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
The male platypus has poisonous spurs on its legs.
58
To escape the grip of a crocodile's jaws, push your thumbs into its eyeballs. It will let you go instantly.
155
A chameleon's tongue is twice the length of its body.
29
Penguins have a gland above their eye that turns saltwater into freshwater.
12
Only female mosquitoes bite and drink blood.
28
Anteaters prefer termites to ants.
18