Pest Library | Norway Rats

Rattus norvegicus

Norway rat - Rattus norvegicus
Color: Gray, brown or black
Legs: 4
Shape: Long
Size: 10 to 12 inches (8″ body plus 4″ tail)
Antennae: No
Region: Throughout the U.S.
These rats have smaller eyes and ears and shorter tails.


Rats are excellent climbers and often enter a home in the fall when outside food sources become scarce.


Norway rats live in fields, farmlands and in structures. Rats are often found in woodpiles. Rodents can gain entry to a home through a hole the size of a quarter.


Rats can chew through wiring, causing fires. They also spread numerous diseases.


Keep firewood stored well away from the structure. Remove debris piles. Seal any holes larger than 1/4 inch. Remove moisture and harborage sources

* Information courtesy of National Pest Management Association, Inc.