The American cockroach, also known as the palmetto bug particularly in the southern United States, is the largest species of common cockroach, and often considered a pest. American cockroach adults grow to an average length of 1.6 inches. They are reddish brown and can travel quickly, often darting out of sight when someone enters a room, and can fit into small cracks and under doors despite its fairly large size. It is considered one of the fastest running insects. American cockroaches generally live in moist areas, but can survive in dry areas if they have access to water. They prefer warm temperatures and do not tolerate cold. In residential areas, these cockroaches are common in basements, crawl spaces, cracks and crevices of porches, foundations, and walkways adjacent to buildings. In cold weather these cockroaches may move indoors, seeking warmer temperatures and food. Cockroaches may enter houses through sewer connections, under doors, around plumbing, air ducts, or other openings in the foundation. The American cockroach is a scavenger that feeds on decaying organic matter and a variety of other foods. It is particularly fond of fermenting foods.