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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.
A five-year trial reintroduction at Knapdale in Argyll started in 2009 and concluded in 2014. [73] A few hundred beavers live wild in the Tay river basin, as a result of escapes from a wildlife park. [74] A similar reintroduction trial is being undertaken on the river otter in Devon, England. [75]
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 ...
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In order to reintroduce beavers, the United States Department of the Interior had already been relocating beavers to the state since 1936. The program was massively successful, as the estimated cost of relocating a beaver to Idaho was $ 8 (equivalent to $180 in 2024) and the estimated value of a beaver's work over its lifespan was US$300 ...
Following findings that the parasite Giardia lamblia, which causes giardiasis, was putatively carried by beavers, the term "beaver fever" was coined by the American press in the 1970s. Further research has shown that many animals and birds carry this parasite, and the major source of water contamination is by humans.