Mammals nocturnal

American Beaver

Castor canadensis

The American Beaver is the world's most industrious architect, turning simple streams into complex wetland wonders. Catch a glimpse of these nocturnal engineers as they fell trees and build their underwater empires right in your backyard.

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Quick Identification

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Size

Length: 34–40 in (86–101 cm); Weight: 24–71 lb (11–32 kg)

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Colors

Rich chestnut brown to dark chocolate fur; blackish, scaly tail; orange-tinted front teeth

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Key Features

Large, flat, paddle-shaped tail
Webbed hind feet and clawed front paws
Massive orange incisors for gnawing wood
Dense, waterproof double-layered fur
Small ears and eyes with a stocky, rounded body

When You’ll See Them

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Activity pattern nocturnal

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Peak hours 7 PM - 5 AM

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Season Year-round

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Diet Strictly herbivorous, consuming the inner bark (cambium), twigs, and leaves of woody plants like willow, aspen, and birch, as well as aquatic vegetation like water lilies and sedges.

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Habitat Freshwater systems including rivers, streams, lakes, and marshes with nearby woody vegetation.

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Behavior

Beavers are nature's ultimate 'ecosystem engineers,' famous for their ability to physically alter their environment to create deep-water refuges. They live in tight-knit family units known as colonies, typically consisting of a monogamous breeding pair and two generations of offspring. Much of their lives revolve around the construction and maintenance of dams and lodges, which provide protection from predators like wolves and coyotes.

While they are quite clumsy on land, beavers are graceful and powerful swimmers. They use their flat tails as both a rudder and a powerful alarm system, slapping the water's surface to warn family members of approaching danger. In suburban settings, they are often known for their persistence, sometimes rebuilding a dam overnight that a homeowner or city worker has spent the day removing.

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Camera Tips

To capture the best beaver footage, location is more important than almost any other factor. Look for 'beaver runs'—narrow, muddy paths where they habitually exit the water to forage for wood. Placing your camera at the water's edge facing one of these slides at a height of about 12 to 18 inches will give you a perfect side-profile of the animal as it hauls branches. Avoid placing the camera too high, or you will mostly capture the top of their backs.

Night vision capability is non-negotiable for beavers. Since they are almost exclusively active after dusk, you want a camera with a high-quality infrared (IR) flash. 'No-glow' or 'Black' IR is preferred, as beavers have surprisingly sensitive senses and may become wary of a visible red glow. Set your camera to record video rather than still photos; a 20-30 second clip will capture the fascinating way they use their dexterous front paws to manipulate food or the heavy waddle of their gait.

If you have a pond on your property, aiming a camera at a 'scent mound'—a pile of mud and debris the beaver has marked with castoreum—is a guaranteed way to get close-up 'sniffing' behavior. Be sure to check your camera settings for trigger speed; while beavers aren't fast, they can disappear into the water quickly if they catch a scent or sound. In the autumn, focus your efforts on their 'food cache'—the pile of branches they stick into the mud near their lodge—as this is when they are most active and visible, preparing for the winter freeze.

Similar Species

Species that look similar or are commonly confused with American Beaver.

Muskrat

Much smaller with a thin, vertically flattened tail rather than a wide, paddle-shaped one.

Nutria

Distinguishable by its round, rat-like tail and prominent white whiskers.

North American River Otter

Has a long, muscular, furred tail and a more elongated, sleek body shape for hunting fish.

Frequently Asked Questions

American Beavers are primarily nocturnal and crepuscular. They usually emerge from their lodges at dusk and remain active throughout the night, returning to sleep just before sunrise.

You cannot easily attract beavers if you don't have a permanent water source. However, if you have a stream or pond, planting native 'softwoods' like willow, aspen, and cottonwood will provide their favorite food and building materials.

Beavers are herbivores. In the winter, they eat the inner bark (cambium) of trees. In the summer, they switch to a diet of softer aquatic plants, clover, and grasses.

Yes, beavers are increasingly common in suburban parks and backyards with water access. They are highly adaptable and will move into any area with enough water and wood to sustain a colony.

Size is the biggest giveaway; beavers are much larger (up to 70 lbs) while muskrats are small (around 2-4 lbs). Additionally, a beaver has a wide, flat tail, whereas a muskrat has a thin, rat-like tail that is flattened vertically.

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