COCKROACHES adapt readily to a variety of environments, but prefer warm conditions found within buildings. Cockroaches leave chemical trails in their feces as well as emitting airborne pheromones, which other cockroaches will follow to discover sources of food and water. They are among the hardiest insects on the planetâ€”some species are capable of remaining active for a month without food and are able to survive on limited resources like the glue from the back of postage stamps. Some can go without air for 45 minutes. They can also passively transport microbes on their body surfaces, including those that are potentially dangerous to humans. Cockroaches have been shown to be linked with allergic reactions in humans, such as asthma.