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
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
Signs of Norway Rat 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.
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 & 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.