What typically distinguishes the physical characteristics of roof rats from Norway rats?

The physical characteristics that distinguish roof rats from Norway rats are indeed often related to the size of their ears. Roof rats tend to have larger, more prominent ears relative to their head size when compared to Norway rats. This characteristic can be a key identifier when observing these two species.

Roof rats also typically possess a slender body compared to the stockier build of Norway rats, and their tails are longer than their bodies, whereas Norway rats have tails that are shorter than their bodies. Additionally, there are differences in fur coloration, with roof rats generally having a slick, dark fur compared to the more muted tones of Norway rats. This combination of traits is essential for proper identification in pest control and management scenarios.