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Seventeen brown bear dens were studied in the Kronotsky Nature Reserve (Russian Far East). The majority of dens were excavated in the ground. The dens were located mainly in the upper part of slopes with southwest aspects in birch forests, dwarf Siberian pine and alder patches. The structure of the dens was typical for brown bear ground dens. There are places in the basin of Shumnaya River in Kamchatka where brown bears prefer to set up their dens.Key words: brown bear, Ursus arctos, den, Kronotsky Nature Reserve. DOI: 10.18500/1684DOI: 10.18500/ -7318-2018 Dens areas are critical habitat for brown bears, and the animals select locations for their dens based on both, human activities and presence of suitable natural habitat (Schoen et al., 1987;McLellan, Hovey, 2001).The studies were carried out in the framework of the research program of the brown bears Ursus arctos Linnaeus, 1758 in Kamchatka region at the territory of the Kronotsky Nature Reserve in the Shumnaya River basin in 2005 -2006. Bear dens were found by searching in the habitat potentially suitable for dens, in places where bears were observed in post-denning period and by visiting the locations of animals with GPS-collars (Paczkowski et al., 2005).

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