- I always use humane traps to capture rodents in the home and while almost half of the rats I capture are Rattus Rattus, many look far more like this species and some are different again. The ones that I believe to be Rattus Fuscipes sometimes make a grunting noise when aggitated. It's an unusual sound to hear from a rodent. They are very distinct in appearance when compared to Rattus Rattus or Rattus Norvegicus. There has recently been an extremely large amount of dry eucalypt forest and dense bushland cleared for the development of several new suburbs in my area which may be part of why they are forced to search for food in a semi-suburban area.