The cockroaches are an ancient group, dating back at least some 320 million years ago. Roaches are brown to reddish-brown in color. They are common and hardy insects, and can tolerate a wide range of environments from Arctic cold to tropical heat. Their size ranges from a half an inch to almost two inches long. Cockroach bodies have a measure of shine to them, and their wings are folded tightly against their backs. They are popularly depicted as dirty pests, though the great majority of species are inoffensive and live in a wide range of habitats around the world.