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Brown Rat / Norway Rat

Rattus norvegicus


  • Up to 15 3/4" in length, with a tail shorter than the head and body.
  • 350 – 500g in weight.
  • Blunt nose, small ears and a thicker body when compared to the Black Rat (Rattus rattus).


  • 7 – 8 young per litter; 3 – 6 litters a year.
  • Gestation period of about 3 weeks.
  • 10 – 12 weeks from birth to sexual maturity.


  • Usually ground living and burrowing, but sometimes climbs. The only species to occur in sewers in the United States.
  • Preferred food is cereals.
  • Will eat around 30g of food a day and drink 60ml.

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