Carpenter Ant: size 1/4 to 1/2 in (workers). Antennae has 12 segments with no club. Black; (other species may be dark brown, dark red or a combination of these colors). Circular ring of hairs at end of abdomen. 
Nest site/characteristics: Moderately sized mature colonies contain more than 3,000 workers with one queen per colony (colonies may contain satellite nests that consist of workers, larvae, and pupae.) Nests usually originate in moist, decayed wood and voids and may later expand into sound wood.  Outside, nests are commonly found in dead or damaged portions of trees, rotting logs and stumps.
Feeding Preference: Feed primarily on insect-produced sugars, plant and fruit juices, and insects. Indoors they feed on food debris, including sweets, eggs, meats, cakes, pet food, and grease. 
Carpenter Ants