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
An alligator can go through 2,000 to 3,000 teeth in a lifetime.
268
When dragonflies mate, their tails form a love heart.
22
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
The ancestor of all domestic cats is the African Wild Cat which still exists today.
12
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6