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Brown rat. The brown rat, also referred to as common rat, street rat, sewer rat, Hanover rat, Norway rat, Norwegian rat, or wharf rat (Rattus norvegicus) is one of the best known and most common rats.
Adult Norway Rats are 12 to 18 inches long including a 5 to 8 inch tail. Fur color on the back and sides ranges from reddish to greyish brown, while the belly is usually white with grey underfur. Norway Rats weigh 7-18 oz. A Rat can eat 10% of its body weight in a day. Normally, a Rat will travel a maximum of about 100 feet for its food and water. The Norway Rat (rattus norvegicus) is found throughout North America; it is also known as Brown Rat, Sewer Rat, Water Rat and Wharf Rat.