Rats Exterminators Exclusion is an important rodent control technique. It will get rid of the rats by making it difficult for them to enter the home or structure. Rats are easier to exclude than mice because rats a typically larger. Focus on areas that may provide water, food or harborage: vegetation, refuse or wood piles, bird feeders, waterways, garages, carports, attics, crawl spaces, cupboards, closets and food storage areas. Entry points are important to consider when inspecting: windows, door thresholds, utility lines, rooftops and downspouts. Rodents have oily hair leaving smudge marks where they consistently travel. Droppings, urine trails and gnawing marks all are signs of rodent activity.Roof Rat and Mouse the feces are critical in determining the type of rodent and measure of activity.