The Norway rat, also known as the brown rat, common rat, or sewer rat, is a constant problem in urban areas across the world. Although it was once thought to have originated in Norway, researchers now believe this species started in China and was able to migrate to every continent, except Antarctica.
Norway Rat Behavior
Norway rats are nocturnal creatures with very good hearing and a great sense of smell. They are also excellent swimmers, climbers, and burrowers. This species of rat generally lives underground in burrows or in cellars or sewers. Norway rats are omnivores, meaning that they eat both plants and meat. Although they usually consume a lot of grain in their diet, they will eat almost anything if needed.
One of the most difficult things about Norway rats is that they can reproduce extremely quickly. Small infestations can grow rapidly if not handled properly. One female Norway rat can have up to 14 pups per litter with upwards of 5 litters per year.