Brown rat

The brown rat (Rattus norvegicus), also referred to as the common rat, street rat, sewer rat, Hanover rat, Norway rat, Norwegian rat, or wharf rat is one of the best known and most common rats.
One of the largest muroids, it is a brown or grey rodent with a body up to 25 cm (10 in) long, and a similar tail length; the male weighs on average 350 g (12 oz) and the female 250 g (9 oz). Thought to have originated in northern China, this rodent has now spread to all continents except Antarctica, and is the dominant rat in Europe and much of North America—making it by at least this particular definition the most successful mammal on the planet alongside humans.[2] With rare exceptions, the brown rat lives wherever humans live, particularly in urban areas.
Selective breeding of Rattus norvegicus has produced the laboratory rat, a model organism in biological research, as well as pet rats.
Category:Animals
Category:Creatures