Beaver
Castor canadensis
Also known as: North American Beaver, Canadian Beaver
The Beaver is the largest rodent in North America and a keystone species that dramatically reshapes landscapes through dam building. While ecologically beneficial in wild settings, beaver dams near human infrastructure flood roads, septic systems, agricultural fields, and timber stands. Beavers also fell valuable ornamental and timber trees with remarkable speed.
Identification
Size
600-800 mm body; tail adds 200-300 mm; 15-32 kg weight
Color
Rich, dark brown fur; large, flat, scaly, paddle-shaped tail; large orange incisors
Key Trait
Largest rodent in North America; unmistakable broad, flat, scaly tail; large orange incisors; webbed hind feet; builds dams and lodges from felled trees and mud.
Behavior & Habitat
Primarily nocturnal. Fells trees by gnawing through the trunk with powerful incisors - can fell a 15-cm-diameter tree in under 30 minutes. Builds dams to create deep-water ponds, and lodges within those ponds for shelter. Family units of 4-8 individuals maintain dam and lodge year-round.
Habitat: Streams, rivers, ponds, and lakes. Builds dams on waterways near human development, flooding roads, fields, and infrastructure.
Diet: Inner bark of trees (especially aspen, willow, birch, and maple), aquatic plants, grasses, and agricultural crops near waterways.
Signs of Infestation
- Trees felled or with deep, cone-shaped gnaw marks near waterways
- Dam structures made of branches, mud, and debris blocking streams or culverts
- Flooding of roads, fields, or low-lying areas upstream of a dam
Risks & Damage
Dams flood roads, septic drain fields, foundations, and agricultural land. Burrows undermine pond dams and embankments.
Floods timber stands and crop fields. Fells valuable fruit, nut, and ornamental trees.
Fells ornamental and landscape trees near waterways.
Prevention Tips
- 1.Wrap the trunks of valuable trees near water with heavy-gauge wire mesh to at least 1 meter height
- 2.Install flow devices (beaver deceivers or Clemson pond levelers) to manage water levels without removing the dam
- 3.Plant unpalatable tree species near waterways - beaver prefer aspen, willow, and birch
Why DIY Treatment Often Falls Short
Removing a beaver dam without addressing the beaver family simply results in the dam being rebuilt, often overnight. Beavers are extremely persistent and will rebuild a dam in the same location repeatedly. Trapping requires specialized skill and permits.
Professional Treatment
Licensed trappers remove beaver families during regulated trapping seasons. Flow-control devices are installed to manage water levels while allowing some beaver activity. Tree protection and strategic planting reduce damage to valuable timber.
Related Pests
Frequently Asked Questions
How fast can a beaver rebuild a dam?
Are beavers protected?
Do flow devices actually work?
Need Help With Beaver?
If you're seeing signs of beaver in or around your home, professional treatment is the fastest way to stop the problem. Lotus Pest Control offers free inspections to identify the issue and recommend the right solution.
At a Glance
- Category
- Wildlife
- Scientific Name
- Castor canadensis
- Size
- 600-800 mm body; tail adds 200-300 mm; 15-32 kg weight
- Color
- Rich, dark brown fur; large, flat, scaly, paddle-shaped tail; large orange incisors
- Key Trait
- Largest rodent in North America; unmistakable broad, flat, scaly tail; large orange incisors; webbed hind feet; builds dams and lodges from felled trees and mud.
- Regions
- Northeast, Midwest, Pacific Northwest, Southeast, Mid Atlantic, Mountain West, Great Plains, West Coast, Gulf Coast
- Threat Level
- High
- Risk Types
- structuralagriculturallawn
- Seasonal Activity
- MarAprMayJunJulAugSepOctNovDecJanFebnonelowmoderatehighpeak