Placing alcohol on a scorpion's back will make it go crazy and fatally sting itself.
1k
The pea aphid insect explodes itself thereby sacrificing its life to protect its relatives from predators.
3
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
Ants have tiny magnetic compasses in their antennae which help them navigate.
9
Flies are deaf.
379