What color is the fur of Norway rats?

Norway rats, scientifically known as Rattus norvegicus, typically have a fur color that ranges from gray to brown. However, the characteristic reddish-brown hue is particularly common, especially on their backs. This color adaptation helps them blend into various habitats, such as urban areas, fields, and woodlands. The shading of their fur can vary, but reddish-brown fur is a defining trait of these rodents, contributing to their identification in the wild.

Other colors may be seen in different contexts, but the prevalent and identification-marking color of Norway rats is indeed this reddish-brown shade.