Family of Castoridae consists of two species, Castor canadensis (the true one or the common one) and Castor fiber (Eurasian or European beaver). In the past Eurasian beaver lived in the area from Eastern Siberia to British Isles. In the end of 19th century, the population of beavers reached to just 1,200 because of the over hunting. But, thanks to the reintroduction, natural spread and protection by the twentieth century, their number has increased to approximately 617,000 on 2003. At present days, you can find them all over Europe, with the exception of Italy, Iberia and the southern Balkans. You can find them as well in Mongolia China and Khabarovsk.
The true beaver that is C. Canadian, are originally from North America. The general beaver are living from arctic to northern Mexico, apart from Nevada, Southern California, some places in Alaska and general part of Florida,. There were few reports of inaccessible populations in places such as Temecula Creek and Southern California also.
Since 1975 Canadensis is Canada's official symbol. Between 1846 and 1882 more than 3.5 million beavers have been killed with the intention to sell in UK by Hudson Bay Company. Furs were so precious that it contributed significantly to the westward settlement and development of human settlement of Canada and North America.
Beavers are known for their normal trait of constructing dams on rivers and streams, and constructing houses, on the pond. Beavers as well build canals, which are very difficult to drag on the ground. They utilize their sharp teeth to cut plants and trees that they utilize for construction and food. Initially, they put vertical poles and then they fill the gaps of the poles with horizontally crisscrossed placed branches. They seal the gaps of the branches by blending mud and weeds until the dam confiscate adequate water to encircle the lodge.
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They are also known for their alarm signal: while starthtened and frightened, a beaver starts dive fast while vehemently spanking the water with its wide tail, and these spanks are heard from great distances under and above water. It warns other beavers in the region. Once one of them sounds the alarm, beavers nearby dive and possibly will not show up for some time. Beavers are sluggish on land, but they are excellent swimmers and can stay under water for near about 15 minutes.