Norway Rat

Norway Rat

 

 

 

 

 

The Norway rat is the largest commensal rodent in the US.

Identification

  • Usually gray in color
  • Small ears
  • Tail is short relative to the head and body
  • Droppings are 3/4 inch and blunt on the ends

Environment

  • Can exist in large numbers in and around residences, basements, stores, warehouses, docks, sewers, or dumpsters
  • Burrow to make nests under buildings, beneath concrete slabs, around ponds, in and around garbage and other locations suitable for food, water, and shelter
  • Nests may be lined with shredded paper, cloth or other fibrous materials
  • Usually become active at about dusk to begin seeking water and food.
  • Eats nearly any type of food but prefers a nutritionally balanced diet, consisting of cereal grain, meats, fish, nuts, and some fruits

Threats

  • Likes to burrow and can form extensive galleries
  • Have litters of 6 to 12 young that can eat solid food within 2 to 3 weeks
  • Young become completely independent at about 4 weeks and reach reproductive maturity as early as 3 months

Treatment

  • Traps placed indoors near entrance points and known runways
  • Burrows outdoors may be baited
  • Exterior bait stations may be placed on the perimeter of the structure