Norway Rat

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

Norway rats are 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

Norway rats 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

Norway rats like 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

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