The most commonly found rat pest in seattle metro king county area is the Norway rat. Norway rats, sometimes called brown or sewer rats, are identifiable by their stocky, gray-brown bodies. Their tails are shorter than their body length and their ears and eyes are small relative to their body. Norway rats are larger than most other rat species. They burrow in gardens and fields, as well as beneath building foundations, trash or woodpiles. Norway rats line their nests with fibrous materials, such as shredded paper and cloth. These rats tend to inhabit the lower levels of buildings.
Roof rats, sometimes called black rats, are superb climbers that tend to nest above ground. In the wild, roof rats inhabit shrubs, trees and dense vegetation. In domestic environments, they seek out secure, elevated places such as attics, walls, sheet rock ceilings and cabinets. They may enter homes through trees close to windows or eaves.