After baiting has begun, continue with sanitation procedures, food source removal, and harborage removal to ensure additional rodents from nearby areas are not attracted to your location. Rodents will gnaw through many types of materials in order to reach a location including lead sheathing, cinderblock, aluminum siding and some concrete. Begin the inspection from the exterior to the interior. Rodents have oily hair leaving smudge marks where they consistently travel. Droppings, urine trails and gnawing marks all are signs of rodent activity.
Feces are critical in determining the type of rodent and measure of activity.
Under each individual catergory of the Norway Rat, Roof Rat and House Mouse, the feces are discussed in detail. The adult house mouse is small and slender and about 1-2 inches long, excluding tail. It has large ears, pointed nose and small eyes. The tail is as long as the head and body combined. The fur color varies, but it is usually a light grey or brown, but could be darker shades.