Beaver
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Beavers are large semiaquatic rodents of the Northern Hemisphere. There are two extant species: the North American beaver and the Eurasian beaver. Beavers are the second-largest living rodents, after
American Beaver
North American beaver (Castor canadensis)
Eurasian beaver (Castor fiber)
Mounted North American beaver skeleton.
Beaver dam
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A beaver dam or beaver impoundment is a dam built by beavers; it creates a pond which protects against predators and holds food during winter. These structures modify the natural environment in such a
Beaver
…habitats, such as rivers, streams, lakes and ponds. They are herbivorous, consuming tree bark, aquatic plants, grasses and sedges. Beavers build dams and lodges using tree branches, vegetation, rocks and mud; they chew down trees for building material. Dams restrict water flow, forming ponds. Lodges…
Beaver dam at Algonquin Park in Ontario, Canada
Beaver dam in Lassen Volcanic National Park
Beavers use rocks for their dam when mud and branches are less available as seen on Bear Creek, a tributary to the Truckee River, in Alpine Meadows, California