The muskrat is about the same size as a cottontail rabbit.
Muskrats have small eyes and ears.
The front legs are short while the hind legs are longer, stronger, and have partially webbed feet. The back is dark or chocolate brown and fades gradually to a lighter brown with a reddish tinge on the sides. The underparts are still lighter, shading to almost white on the throat. Some of the highest numbers are found in the northeastern and northwestern parts of the state. Muskrat populations can change greatly from year to year depending on weather conditions and other factors.