Norway Rats

Norway Rat Facts

Scientific Name:

Rattus Norvegicus

Color:

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

Weight:

10-16 ounces; larger than Roof Rat

Length:

7-10 inches

Tail Length:

6-8 inches; shorter than the body

Body:

Heavy & thick body, blunt nose

Ears:

Relatively small; close to body

Eyes:

Large & protruding black eyes

Lifespan:

5 to 12 months

Droppings:

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

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

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.