Thursday, January 23, 2014

North American Beaver

North American Beaver
The beaver  is a primarily nocturnal  large semi-aquatic rodent. Castor includes two extant species, North American beaver  and Eurasian beaver .Beavers are known for building dams canals and lodges  ore 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 1988 was 6-12 million. This population decline is due to extensive hunting for fur, for glands used as medicine and perfume, and because their harvesting of trees and flooding of waterways may interfere with other land uses.
Source:Beavers are known for their natural trait of building dams on rivers and streams, and building their homes  in the resulting pond. Beavers also build canals to float building materials that are difficult to haul over land . They use powerful front teeth to cut trees and other plants that they use both for building and for food. In the absence of existing ponds beavers must construct dams before building their lodges. First they place vertical poles, then fill between the poles with a crisscross of horizontally placed branches. They fill in the gaps between the branches with a combination of weeds and mud until the dam impounds sufficient water to surround the lodge.


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