Ant Hill

Anthills are created as a by-product of worker ants digging subterranean tunnels.
As the worker ants dig out the colony's tunnels, they dispose of the displaced earth by carrying it back out of the colony and depositing it near the entrance. 

All ant hills are interlaced with many chambers which are connected by tunnels. These small rooms are used for nurseries, storing food, and even as resting places for the worker ants.