To determine if you have an infestation, it’s crucial to know a few things. Cockroaches are nocturnal and prefer to live in cool, damp, and dark areas. They are able to flatten their bodies, which enables them to fit under narrow spaces. If you notice a musty, oily smell and see the bodies of dead cockroaches, you might have a serious infestation. Cockroaches, though associated with uncleanliness, can actually come into a house in multiple ways. They can fly in when attracted to light, come in through the plumbing, or just crawl in the house through a crack under the door or in the wall. They are commonly found in spaces such as under the sink, behind the fridge, behind wallpaper, or even under mats. Large cockroaches leave cylindrical droppings, while small cockroaches leave droppings that resemble ground pepper. If you see cockroaches during the day, this most likely means they were forced out of their nest due to over-crowding. If you see any cockroaches during the day, immediately call an exterminator.