Inspection: Reading the Signs Before setting a single trap, you need to know where they live and travel. Look for: Droppings: Fresh droppings are dark and moist; old ones are gray and crumbly. Rub Marks: Rats have oily fur. They leave dark, greasy "smudges" along baseboards and near holes. Gnaw Marks: Freshly chewed wood or wires will be light-colored. Runways: Flattened grass or clear paths through dust or insulation. No For control, contact Prarambh Pest Control.