American Beaver
Castor canadensis
Mammal · Common and secure throughout Iowa, with populations successfully managed through regulated trapping seasons following historical recovery efforts.
Summary
The American beaver is a large, semi-aquatic rodent known for its ability to construct complex dams and lodges. As Iowa's largest rodent, it features webbed hind feet and a wide, flat, scaly tail used for balance and communication. Beavers play a vital role in shaping local ecosystems by creating wetlands that benefit many other wildlife species.
Identification tips
Adults weigh between 35 and 60 pounds and possess dense, dark brown fur. They have prominent, orange-colored front incisors used for cutting wood. The most distinct identification feature is the broad, flat, paddle-shaped tail.
Habitat
Found throughout Iowa near permanent bodies of water such as rivers, streams, lakes, and marshes. They require access to woody vegetation, particularly willow, aspen, and cottonwood, for food and construction material.
Similar species
Can be confused with the muskrat or nutria, though beavers are significantly larger and feature the unmistakable flat tail rather than a long, thin tail.
Sources
Sightings on Iowa Wildlife
No sightings have been linked to this species yet.
Species text is a short compilation for this site, not an official DNR page.