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
Penguins have a gland above their eye that turns saltwater into freshwater.
12
In Australia, there are spiders big enough to eat snakes.
20
When a male honey bee climaxes during sex, his testicles explode and then he dies.
27
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Whales and dolphins can't taste anything other than salt.
11