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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.
Identification. The Norway rat has many names. It is often referred to as the brown rat, common rat, sewer rat, Hanover rat, Norway rat, Brown Norway rat, Norwegian rat, or wharf rat.Rats have coarse fur that is usually dark grey or brown on the backside and light grey or brown on the underside.dentification. The Norway rat has many names. It is often referred to as the brown rat, common rat, sewer rat, Hanover rat, Norway rat, Brown Norway rat, Norwegian rat, or wharf rat.