Sewer rats have a maximum body length of 10 inches, with tails of a similar length. They can weigh up to 2 pounds, but specimens of this size are rare in the wild. Sewer rats go by many names, such as "brown rats," "wharf rats" and "Norway rats."
Sewer rats are among the largest members of the mouse family. The species is native to the forests and shrublands of northern China, but today it lives in most cities and nearly every port city in the world. Sewer rats can adapt to a wide range of environments and survive on almost any diet.