Appearance: May grow up to 1 1/2 inches and are reddish brown with yellow behind the head Habitat and Behavior: They prefer moist areas and are often found in sewers and basements of buildings. They generally do not infest in homes and buildings due to their larger size and slow development. They have been known to fly during the mating season. Diet: American cockroaches are scavengers that mainly feed on decaying organic matter as well as many other types of food . Control: More easily controlled with insecticide sprays due to their larger size. Treating cracks and crevices around areas where they have been seen is effective.