ANTS form colonies that range in size from a few dozen to colonies which may consist of millions of individuals. Their ability to exploit resources brings them into conflict with humans, as they can damage crops and invade buildings. They carefully select their nest sites and will avoid sites with dead ants, as these may indicate the presence of threats or disease. They are quick to abandon established nests at the first sign of threats. Populations are controlled using insecticide baits, either in granule or liquid formulations. Bait is gathered by the ants as food and brought back to the nest where the poison is inadvertently spread to other colony members. Boric acid and borax are often used as insecticides that are relatively safe for humans.