#brown_rat__brownrat__Norway_rat__Rattus_norvegicus  common domestic rat; serious pest worldwide
  supertype:  rat  any of various long-tailed rodents similar to but larger than a mouse
  member of:  genus_Rattus
  subtype:  wharf_rat__wharfrat  brown rat that infests wharves
  subtype:  sewer_rat__sewerrat  brown rat commonly found in sewers

No statement uses or specializes brown_rat; click here to add one.