Rats establish foraging paths and rarely stray from them. As a result, tracks are often clearly visible to those who know what signs to look for. Rats produce a four-toed front and five-toed back footprint. They are mostly easily seen in muddy or dusty locations. Unfortunately, they can be confused with other footprints such as squirrels.
Another sign of rat infestation is signs of chewing close to foraging paths. The front teeth of the rat are perpetually growing. As a result, these rodents must gnaw on hard surfaces to keep their teeth at a manageable length. Rats also gnaw through wood and other unyielding surfaces in search of food sources. Rat droppings and urine stains are other indications of rat activity. They often are deposited along favored travel pathways.