The first and foremost clue for any serious rodent infestation is the sight of dropping in your kitchen drawers, counters, and the cabinet area.
The possible tracks for rodents are observed in dust, mud or dirt. At times, rat tails can leave the mark around the area. Mouse tracks are also easily traceable on the dusty surfaces.
Rats follow a similar route every day while making rounds for food every night. While doing so, rats leave 50 mm wide traces of runways in grass or dirt, mostly next to fences or buildings.
Rats keep chewing on everything they come across with their incisor teeth. If you see holes in ceilings, walls, trails in subfloors, under or behind cupboards, bathtubs, counters, etc, they could be done by the rats.
Burrows are found all along the walls, ditches, fences, woodpiles, low vegetation or concrete slabs and rats are experts in burrowing.
Urine stains are easily traceable under the light.
Rat’s oily skin fur leaves grease marks on various surfaces.
Rat nests can be easily found in the roof voids, utility closets, basements, and garages. They are made of shredded papers and look like a loosely woven ball.
Though rats are not visible in the darkness, you can easily sense their presence through the noises they make in the dark.
In a badly ventilated room, you can easily smell rat urine or their musky odour.
Partially consumed food
Rats leave behind half-eaten food and so that can be an easy sign for you.
Dead or live rodents
Rodents are nocturnal but in an area with high rat populations, some of the low ranked ones will hunt out during the daytime. Probably, because they are unable to get hold of food during the night.