signs of rodents

Quick Answer: The clearest signs of a rodent infestation include droppings, dark grease marks along walls, gnaw marks on wood or wiring, shredded nesting material, scratching sounds at night, and a musky ammonia-like smell. Rats and mice are mainly active at night, so these signs often appear before you see the animal itself. A rodent problem does not usually begin with a rat suddenly running across the kitchen floor. By the time that happens, there may already be activity hidden…