The most common nuisance ant is the small ant, which comes in shades of black and brown. Many species make up this group, including house ants, pharaoh ants and pavement ants. These are the ants that often enter the home, foraging for food or in search of shelter. Small ants have a wide variety of feeding habits. Some feed on sugar or starch substances, while others feed on grease or protein.
Ants live in colonies that are made up of sterile female workers, short-lived males and an egg-laying female queen. Ants that enter the home are worker ants. They communicate with others by means of a pheromone, and deposit of this pheromone is what leads the ants to form trails.