Shape and size:
Norway rats are one of the largest rats that we encounter in the Pacific Northwest. Norway rats can reproduce all year long but the highest rates of reproduction generally occur in the fall. Norway rats are very well accustomed to the city life.
Signs of a Norway Rat infestation:
Norway rats are primarily active at night. Because of this, homeowners are usually unaware of their presence until signs become more obvious. Norway rats are typically found in dark areas like crawl spaces under homes. Outdoor burrows, or nests in or near the ground, and rat droppings are indicators of a Norway rat infestation.