During the years 1982-1985 and 1994 12 pairs of beavers from the Mazurian Lake District were reintroduced into the central part of the Polish Carpathian Mountains (Beskid Sądecki and Beskid Niski). In 2000 an inventory was taken of the beavers and the environment where they settled was described. The wanderings and movements of the beavers in their search for new biotropes were analyzed. Based on dens and buildings (lodges, dams) it was estimated that there were 44 animals in the area under study. The nature of feed bases and feed preferences were described. The trees most frequently found were sallow and alder.

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