Termite: Termites live in colonies in underground tunnels which they construct. The colony consists of different casts. Here we see a soldier and three worker termites. The large head of soldiers has a relatively thick cuticle and large mandible which are used to defend the colony against ants, their primary enemy. Workers, the most common caste, are charged with digging tunnels and chambers, cleaning the colony, farming fungus, and caring for the queen.