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1935 - Finland: in 1935, 17 Eurasian beavers were reintroduced, then two years later North American beavers sourced from New York were released. At the time, a difference between the species was unknown. Today, the North American beaver is considered an invasive species in Finland, and outnumbers Eurasian beavers 5:1.
The Eurasian beaver (Castor fiber) or European beaver is a species of beaver widespread across Eurasia, with a rapidly increasing population of at least 1.5 million in 2020. The Eurasian beaver was hunted to near-extinction for both its fur and castoreum , with only about 1,200 beavers in eight relict populations from France to Mongolia in the ...
The English word beaver comes from the Old English word beofor or befor and is connected to the German word biber and the Dutch word bever.The ultimate origin of the word is an Indo-European root for ' brown '. [2]
North American beaver skeleton (Museum of Osteology) Lithograph of a Canadian beaver, 1819. The beaver is the largest rodent in North America and competes with its Eurasian counterpart, the European beaver, for being the third-largest in the world, both following the South American capybara and lesser capybara. The European species is slightly ...
Skull of a beaver. Castoridae is a family of rodents that contains the two living species of beavers and their fossil relatives. A formerly diverse group, only a single genus is extant today, Castor. Two other genera of "giant beavers", Castoroides and Trogontherium, became extinct in the Late Pleistocene.
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European-made guns, for example, increased the efficiency of beaver hunting, but led to the animal's rapid extermination forcing traders into costly, long-distance searches for new sources of supply. Later, the decline of the white pine, a vital commodity in the lumber trade, forced the shift to pulp and paper production based on abundant spruce.
The article says the European beaver is larger than the American beaver, but American's average size is 20 kg while the European average is 18 kg, and the American ones can weigh "up to 45 kg" but the largest European wieghed 31.7 kg. I think there's a mistake somewhere.