21.  Rats
Rats are seen or heard in the attic, garage, basement, wall voids, or other areas of the home. Signs of rat infestation include droppings, tracks, and loosely constructed nests made of rags, paper, and other scraps. Pipes, beams, and wiring may be gnawed. Books, fabrics, furniture, and other objects may be chewed or shredded, and packages of food may be gnawed open and the contents eaten.