Beaver Biology

High Quality Beaver Control Services In MN

About Beavers In Minnesota

Beavers are a primarily nocturnal, semi-aquatic rodent, the largest in North America. They can grow up to 31 inches in length, and typically weigh between 35 and 66 pounds. They have short legs, small rounded ears, and large hind feet with webbing between the digits. Beavers have (color) fur and a distinctive paddle shaped tail that can grow up to 18 inches in length. They possess sharp incisors and lips that can close behind their teeth, allowing them to swim while carrying branches in their mouth.
Beavers are herbivores and will consume both green and woody plants. Preferred food sources are the bark of aspen, poplar, willow, alder and red maple. Lily pad roots are also a favorite. Here in Minnesota, beavers will create large underwater food caches to help them get through the winter. Beaver will drop many trees in the late fall in order to build these food caches.
Beavers live in family groups called colonies. They are very territorial and will mark their territories with castoreum from their scent glands.An established colony is typically made up of an adult male and female, their offspring of the current year and sub-adults from the previous year’s litter. A colony’s total size will generally be 4-10 related individuals.

Beavers have one litter per year of 2 to 4 young. Breeding occurs over winter and the young are born in the spring, typically April or May in Minnesota. At about 2 years of age, mature offspring are displaced from their colony and must seek out new territory. This dispersal typically occurs in the spring just prior to the arrival of a new litter. These dispersing beavers will pair up and form new colonies in unoccupied territory. 

Colonies reside in island or bank lodges, or bank dens. These are constructed of sticks, branches, trees, mud and similar materials, as well as the banks of a body of water. They will possess one or more underground entrances, and an interior chamber above the waterline.

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