In its introduced range, the dammi In its introduced range, the damming activity of the beaver can cause flooding which can damage forests. They also have the ability to quickly cut down large numbers of trees. In Finland, they compete with native beaver populations. In their native range, they cause flooding on major highways by plugging highway culverts. Castor canadensis beaver is a large hervbivorous rodent typically found near water.
Beavers are found throughout all of North America except for the northern regions of Canada and the deserts of the southern United States and Mexico. Frazier, Beavers live in lodges, of which there are three types: those built on islands, those built on the banks of ponds, and those built on the shores of lakes. The island lodge consists of a central chamber, with its floor slightly above the water level, and with two entrances. One entrance opens up into the center of the hut floor, while the other is a more abrupt descent into the water. Encarta,
The beaver genus Castor is a large, primarily nocturnal , semiaquatic rodent. They are the second-largest rodent in the world after the capybara. Their colonies create one or more dams to provide still, deep water to protect against predators, and to float food and building material. The North American beaver population was once more than 60 million, but as of was 6—12 million. This population decline is the result of extensive hunting for fur, for glands used as medicine and perfume, and because the beavers' harvesting of trees and flooding of waterways may interfere with other land uses.
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