Species › Mammals › North American Beaver

North American Beaver

Castor canadensis

CommonMammal
Illustration of North American Beaver (Castor canadensis)
Safety note: Bites when cornered — do not handle.

The North American Beaver is the continent's largest rodent and one of the most powerful ecosystem engineers in the animal kingdom, transforming flowing streams into ponds and wetlands that increase biodiversity across entire watersheds. It fells trees with its powerful, self-sharpening orange incisors and uses them to construct dams and lodges of mud and sticks. Beavers were so heavily trapped in the 18th and 19th centuries for their fur that they were extirpated from much of their range, but have since recovered broadly across North America.

Habitat
Rivers, streams, ponds, and lakes in forested and shrubby landscapes
Diet
Bark, twigs, aquatic plants, and stored winter food caches
How common
Common

Best time to see a North American Beaver

The best time to see a North American Beaver is January–June, when about 63% of U.S. sightings happen, based on 50,685 research-grade iNaturalist observations.

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