American Beaver

American Beaver

Castor Canadensis

Least Concern

Quick Facts

Kingdom: Animalia
Abundance: Common
Habitat: Wetland
Activity: Crepuscular (Active at dawn/dusk)
Lifespan: 10-20 years

A large, heavyset animal that is well known for building dams in small rivers and streams, often producing sizable ponds. Beavers have short legs, large, webbed hind feet, and can commonly weigh as much as 60 lbs. Using their powerful jaws and large teeth, beavers can bring down medium-sized trees, using the branches in their dams and eating the tender bark and buds. Beavers also build dome-shaped lodges out of sticks and mud with tunnel entrances below water level. During the early 1900’s, beavers were trapped to near extinction for their prized coats, but have made a strong comeback since then.

Diet

Eat bark and cambium (soft tissue under tree bark) as well as water vegetation

Activity Pattern

Crepuscular (Active at dawn/dusk)
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Family: Castoridae
Genus: Castor
Species: Castor canadensis

Scientific Name

Castor Canadensis

Common Name

American Beaver
Breeding Season
Winter, January or February, Breed once a year
Lifespan
10-20 years

Tracks or Signs

Obvious dams, Piles of woodchips at the base of felled trees, paths where beavers enter and leave the water called "slides"

Behavior

Beavers live in small colonies of related individuals and are territorial. They secrete a musk-like substance called castoreum to mark their territory. Beavers will slap their tails against the water to warn others of danger.

Ecological Role

Beavers are a keystone species with large ecological impact. Their dams slow the flow of flood waters, prevent erosion and create habitat for aquatic organisms. Their dams also help with wildfire mitigation by creating wet, fire resistant landscapes.

Activity Pattern

Crepuscular (Active at dawn/dusk)

Habitat Types

Wetland

Geographic Distribution

Found throughout North America except for northern most parts of Canada and the deserts of the United States

Local Abundance

Common

Conservation Status

Least Concern

This species is widespread and abundant. No immediate threat to survival.

Threats & Impacts

Hunting, trapping, pollution and habitat loss

How You Can Help

  • Report sightings to contribute to population monitoring
  • Support habitat conservation efforts
  • Follow guidelines when observing wildlife

Additional Notes

Baby beavers are called kits

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Gallery

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