Early American humans hunted car-size armadillos and used their shells for houses.
12
Sharks, like other fish, have their reproductive organs in their chests.
248
Cats and dogs can hear ultrasound.
350
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