• Norway Rat Smallanimal pests

    Norway Rat
  • Norway Rat


Outside, we suggest you place a bait station with moisture resistant paraffin-covered rodenticide block near rat burrows or where the rat is active. Maintain an uninterrupted supply of fresh bait until there is no more evidence of activity (chewed bait for example). To determine if the rats are still active, block the openings into the burrow. If you see that some of the openings have subsequently been re-opened, the rats are still active in that area.

Inside your home, the first step is to find the openings through which the rats are entering and take the necessary steps to close them quickly. Breaks around pipe entries are often the source of the problem. To eliminate rats, we suggest you use Maheu&Maheu Glue Traps in cardboard boxes and snap traps along vertical surfaces. Use peanut butter rather than cheese as bait because peanut butter dries out less quickly and rodents love it.

Use of rat rodenticide indoor is not recommended. In fact, contrary to popular belief, there is no product on the market that can dry out a rodent's body without leaving an odor.


  • Locate and block off any entry points
  • Set snap traps indoors
  • Set up bait stations with rodenticide outdoors


  • Plug or put screen over any opening wider than 1.25 cm (1/2 inch)

Description and development

The Norway Rat is also known as the sewer rat, brown rat, wharf rat, and water rat. Its weight varies from 300 g to 500 g, and it is 18 cm to 25 cm in length. Its tail, darker in color on top, is shorter than its body and head combined. Its small ears look half buried in its fur, which varies in color from reddish brown to grey brown.
The female rat gives birth to between 8 and 12 young per litter. She can have up to seven litters a year for an average of 20 to 30 young in her lifetime. In their natural habitat, rats live from six to twelve months, and the male usually lives longer than the female.


Rats are pests that can cause structural damage to buildings that result in significant financial loss. They may also damage furniture, destroy food containers, and contaminate food. Rats are primarily active at night, usually when people are absent from their homes. However, it is not unusual for a hungry rat to eat during the day.

Often Norway rats build their nest in the ground. First they look for food outdoors, and if this is not possible, will enter buildings in search of food, returning outside when they are done. Some rats, however, may spend their entire lives inside, building their nest in an enclosed area where there is no human activity. Rats prefer food rich in fat but they are not picky and will eat whatever is available.

Rats' eyesight is very poor and they are color-blind, only distinguishing different intensities in light. Nevertheless, they have keen sense of smell, touch, taste, and hearing, which compensates for their weak eyesight. Norway Rats are cautious and shy away from newly introduced objects in their territory. This wariness is even more pronounced in the adult rat.

Rats jump, climb, swim, and gnaw. Some can jump one meter (3 ft.) into the air and when in difficulty, won't hesitate to leap into space, even if the drop is quite far proportional to their size. They can easily climb pipes, wires, and rough walls. Rats also have amazing balance: they can run horizontally on a wall or electrical wire, using their tail as a counterbalance. Norway Rats are also very good swimmers. Because they must drink water at least once a day, their dens are often close to a water source.


Droppings, runways, gnawed material, and even agitated household pets are all evidence of rodent infestation.

It is very important not to alter the rats' environment when attempting to eliminate them, because they are very cautious and will sense something abnormal is going on. For this reason, do not modify bait placement during the entire period you are working to eliminate them.

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