Beavers are known for their natural damming of rivers and streams, and building their homes (known as "lodges") in the resulting pond. Beavers also build canals to float building materials, which are difficult to bring to the Earth. In the absence of existing ponds, beaver dams have to build before the construction of their homes. This serves as a warning to beavers in the area. Once a beaver has started the "near Beaver diving alarm and can not be slow for some time.
Beaver on land, but are good swimmers and can stay as long as 15 minutes under water. Beavers are herbivores and prefer cottonwood, poplar, willow, alder, birch, maple and cherry. They also eat sedges, pondweed, and water lilies This insulation of snow often keeps the water from freezing in and around the food stack and provides a place where beavers breathes outside of her house. Fossil remains of beavers in the peat and other superficial deposits of Great Britain and continental Europe, while found in the Pleistocene formations of Great Britain and Siberia, the remains of a giant extinct beaver Trogontherium cuvieri, which is a genre in itself.
Beavers have webbed rear, and a broad scaly tail. The teeth of a beaver continuously, making it grow is not borne by chewing on wood. Beavers continue to grow throughout their lives. Beavers live up to 24 years in the wild. Genetic studies have shown its European and North American beaver populations of different species and that hybridization is unlikely. Beavers are closely related to squirrels (Sciuridae), agreeing in certain structural peculiarities of the lower jaw and skull.
Eurasian beavers tend to be a bit bigger, with large heads, less rounded, muzzles narrower, thinner, shorter and easier to narrow down, less oval and shorter tails tibia, which makes it less capable of getting around on two legs of species in North America . Eurasian beavers have longer nasal bones. The foramen magnum in the beaver and rounded triangular North America. The anal glands of the beaver are larger and thin-walled, with a large internal volume of races in North America.
North American beavers have 40 chromosomes, while Eurasian beavers have the 48th In addition, more than 27 studies have been made in Russia, the two species hybridize, with a choice between a man and the North American beaver female European what a stillborn kit. The habitat of the beaver is the riparian zone, including the bed of the river. The beaver works as a keystone species of the ecosystem by creating wetlands that are used by many other species.