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Sunday, May 20, 2012

Beaver


Beauty Of Animal | Beaver | The beavers (genus Castor) is a predominantly nocturnal, large, semi-aquatic rodents. Castor comprises two species of North American beaver (Castor canadensis) (native to North America) and the Eurasian beaver (Castor fiber) (Eurasia). Beavers are known for building dams, canals, and lodges (homes). They are the second largest rodent in the world (after the capybara). Their colonies one or more dams to provide still, deep water to protect against predators, and food and building materials float. The North American beaver population was once over 60 million, but in 1988 was 6 to 12,000,000. The population decline is due to extensive hunting for fur, for glands used as medicine and perfume, and because their harvesting of trees and flooding in streams can interfere with other land uses
Beavers are known for their natural functions to build dams on the rivers and streams, and build their homes (known as "scientists") in the resulting pond. Beavers also build canals float building materials that are difficult to transport over land. They use powerful front teeth to trees and other plants that they use both the building and food cutting. In the absence of existing ponds, beavers build dams before they build their huts. First, the vertical piles, fill between the poles with a crisscross of horizontally oriented branches. The openings between the branches with a combination of weeds and mud to the dam impounds enough water to surround the lodge.
Scientific classification

Kingdom:     Animalia
Tribe:         Chordata
Class:         Mammalia
Order:         Rodentia
Family:        Castoridae
Genus:         Castor

They are the only remaining members of the family Castoridae that a single species, Castor contains. Genetic research has shown that European and North American beaver populations are different species and that hybridization is unlikely. Beavers are closely related to squirrels (Sciuridae), agreeing in certain structural features in the mandible and the skull. In the Sciuridae the two main bones (tibia and fibula) in the lower half of the leg is completely separated, the tail is round and hairy, and the habitats and trees on the land. The beavers or Castoridae these bones are in close contact with their subject, the tail is depressed, widened and scaly, and their habitat is water.
Habitat for the beaver is the riparian zone, including the power bed. The actions of beavers for hundreds or thousands of years ("not specific enough to control") in the Northern Hemisphere have kept these watery systems healthy and in good condition, although a human observing the downed trees might think that beavers did exactly the opposite. The beaver works as a keystone species in an ecosystem by creating wetlands that are used by many other species. Besides humans, no other preserved animals seem to do more to shape the landscape
Beavers fell trees for several reasons. They fell large trees, usually at strategic locations around the base of a dam has to offer, but the European beavers tend to have a small diameter (<10 cm) trees for this purpose. Beavers fell small trees, especially young second growth of trees for food. Deciduous trees grow out again as a coppice, which provides easy to stems and leaves to reach for food in subsequent years. Ponds created by beavers can also kill some trees by drowning, but this leads to standing dead wood, which is very important for a wide variety of animals and plants

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