The brown rat , common rat , sewer rat , LOCATION@1 rat , LOCATION@2 rat , MISC@1 rat , or wharf rat -LRB- Rattus norvegicus -RRB- is one of the best known and most common rats .

The brown rat , common rat , LOCATION@1 rat , LOCATION@2 rat , MISC@1 rat , or wharf rat -LRB- Rattus norvegicus -RRB- is one of the best known and most common rats , and also one of the largest .
