Brown rat

The brown rat (Rattus norvegicus), also known as the common rat, sewer rat, street rat, wharf rat, Norway rat, or Norwegian rat, is a widespread rat species that is thought to believe that originated in northern China, but is introduced elsewhere, and is the dominant rat in Europe and much of North America. With rare exceptions, brown rats are found everywhere humans live, such as urban areas. The fur is most often brown or dark gray, while the underparts are lighter brown or gray. It is one of the largest murids, weighting twice as much as the black rat, and many times more than the house mouse, usually weighing around 140 to 500 g. The head and body length ranges from 15 to 28 cm, while the tail ranges from 10.5 to 24 cm, thus being shorter than the head and body.