Pest Guides

Brown Rat

Rattus norvegicus


Brown Rat

  • Brown Rats are up to 40 cm in length, with a tail shorter than their head and body.
  • Brown Rats are typically 350 – 500g in weight.
  • The Brown Rat is identified by their blunt nose, small ears and a thicker body when compared to the Black Rat (Rattus rattus).


  • The Brown Rat has 7 – 8 young per litter; 3 – 6 litters a year.
  • The gestation period of the Brown Rat is approximately 3 weeks.
  • Within 10 – 12 weeks from birth, the Brown Rat reaches sexual maturity.


  • These types of rats are usually ground living and burrowing, but sometimes also climb and are also seen in sewers.
  • The preferred foods of Brown Rats are cereals.
  • Brown Rats will eat around 30g of food a day and drink 60ml of liquids.