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European beaver, Castor fiber (Linnaeus, 1758) was reintroduced into the lowland part of the Vistula basin in 1975-1985. The animals originated from the river basins of Neman and Pergola rivers or came from a beaver farm. Sixteen small populations were formed, composing 2 to 11 (mostly 4) families. The total number of the reintroduced beavers was 168, and in the first year they set up 64 sites.

Effects of reintroduction of European beaver in the lowlands of the Vistula basin