European settlers and trading ships introduced the Norway Rat into the United States about 1775. It is the most widely distributed rat species in the United States, and is found in your city, perhaps in your neighborhood, may be in your own backyard. It has a stocky body, weighing between 12 and 16 ounces. The body fur is coarse and ranges from reddish to grayish brown with buff white underparts. The nose is blunt, and the ears are small, close set, and do not reach the eyes when pulled down. The tail is shorter as compared to that of the roof rat's tail. The average female rat has 4 to 7 litters per year and may successfully wean twenty or more pups annually.
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