Norway Rats

Norway Rat Facts

Scientific Name:

Rattus Norvegicus


Usually grayish-brown, but color varies from a pure gray to a reddish brown; hard to identify by color alone


10-16 ounces; larger than Roof Rat


7-10 inches

Tail Length:

6-8 inches; shorter than the body


Heavy & thick body, blunt nose


Relatively small; close to body


Large & protruding black eyes


5 to 12 months


¾ inch long with blunt ends; dark color; found in groupings


Norway Rats - Identify Damage

Droppings, gnaw marks, and urine odors are just a few signs of rat activity.



Droppings are the most commonly encountered evidence of rodent activity. Even a small rat infestation can produce literally thousands of droppings in a short period of time.

An adult rat typically produces 40 to 50 droppings per day. These fecal pellets are usually dark-colored, 3/4 inch in length, and blunt at both ends.

Gnaw Marks

Gnaw Marks

Evidence of recent gnawing is an excellent sign for determining the presence of Norway Rats.

Rats tend to gnaw on wooden structures such as corners, floor joists, and wall studs. When Norway Rats gnaw holes into cartons and boxes, the holes typically measure about 2 inches in diameter and often contain rough, torn edges.

Sounds and Odors

Sounds & Odors

Another indication that rats are present is a strong musty odor. Cats and dogs may excitedly sniff and probe an area where rats or mice are present, and often indicate this by scratching or making unusual sounds.


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