The answer to 'what causes rodent' is that rodents are attracted to homes and buildings for a few key reasons: food, shelter, and nesting materials. Rodents like mice, rats, squirrels, and chipmunks are constantly searching for reliable sources of food, warm and dry places to build their nests, and soft materials to line their nests. Homes and buildings often provide all of these things, making them an attractive target for rodent infestations.
Rodents are resourceful and can squeeze through very small openings to gain access to a building. They are also prolific breeders, so a small number of rodents can quickly turn into a large infestation if left unchecked. Signs of a rodent problem include droppings, gnaw marks, nesting materials, and even sightings of the rodents themselves.