Ants are one of the most successful groups of insects. They exhibit 4 distinct life stages; egg, larvae, pupae and adult. About 700 species of ants occur in the United States, with only about 25 of these commonly infesting homes. In the Pacific Northwest, 5 species are of note: carpenter ants, moisture ants, odorous house ants, pavement ants, and pharaoh ants. The biology and habits of these ants may differ, so proper identification is important for a correct control procedure to be initiated.