Sergey Gorshkov / NOT FOR WEBSITE Close-up of Brown bear (Ursus arctos) in lake, Kamchatka, Far east Russia, August

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) leaping through water to catch salmon in river, Kamchatka, Far east Russia, August

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) walking beside lake, Kamchatka, Far east Russia, August

Sergey Gorshkov / Kamchatka brown bear (Ursus arctos beringianus) mating, Kamchatka, Far east Russia, May

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) walking beside lake, Kamchatka, Far east Russia, August

Sergey Gorshkov / Kamchatka brown bear (Ursus arctos beringianus) mother and three cubs swimming across lake, Kamchatka, Far east Russia, June

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) catching salmon in river, Kamchatka, Far east Russia, August

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) catching migration salmon in river, Kamchatka, Far east Russia, August

Sergey Gorshkov / Kamchatka Brown bears (Ursus arctos beringianus) fighting, Kamchatka, Far east Russia, July

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) running through water, fishing, Kamchatka, Far east Russia, August

Sergey Gorshkov / Kamchatka brown bear (Ursus arctos beringianus) mother leads three cubs over hillside in snow, Kamchatka, Far east Russia, May

Sergey Gorshkov / Silhouette of Kamchatka Brown bear (Ursus arctos beringianus) ) beside Lake Kuril at dawn, Kamchatka, Far east Russia, August 2008

Igor Shpilenok / Kamchatka brown bear (Ursus arctos beringianus) fishing for salmon in the Kronotskaya River at the foot of the Kronotsky Volcano, covered with a fresh coat of snow in September, Kronotsky Zapovednik,...

Igor Shpilenok / Kamchatka brown bear (Ursus arctos beringianus) at the "Stained glass window" in the Valley of the Geysers, Kronotsky Zapovednik, Kamchatka, Far East Russia

Igor Shpilenok / Brown bear {Ursus arctos} resting in the spring sunshine, Kronotsky Zapovednik, Kamchatka, Far East Russia

Igor Shpilenok / Kamchatka brown bear (Ursus arctos beringianus) on slope, Kronotsky Zapovednik, Kamchatka, Far East Russia

Igor Shpilenok / Kamchatka brown bear (Ursus arctos beringianus) at the Malachite Grotto, Valley of the Geysers, Kronotsky Zapovednik, Kamchatka, Far East Russia

Igor Shpilenok / Kamchatka brown bear (Ursus arctos beringianus) male sniffing the tracks of a female in snow, Kronotsky Zapovednik, Kamchatka, Far East Russia

Igor Shpilenok / Kamchatka brown bear (Ursus arctos beringianus) at the 'Stained glass window', Valley of the Geysers, Kronotsky Zapovednik, Kamchatka, Far East Russia

Igor Shpilenok / Kamchatka brown bear (Ursus arctos beringianus) enjoys hot steam from a geyser in Valley of the Geysers, Kronotsky Zapovednik, Kamchatka, Far East Russia

Igor Shpilenok / Kamchatka brown bear (Ursus arctos beringianus) near photographer's wooden cabin, Valley of the Geysers, Kronotsky Zapovednik, Kamchatka, Far East Russia

Igor Shpilenok / Kamchatka brown bear (Ursus arctos beringianus) feeding on Sockeye salmon prey, Kronotsky Nature Reserve, Kamchatka, Far East Russia

Igor Shpilenok / Kamchatka brown bear (Ursus arctos beringianus) chasing each other beside water, Kronotsky Nature Reserve, Kamchatka, Far East Russia

Igor Shpilenok / Kamchatka brown bear (Ursus arctos beringianus) catching Sockeye salmon prey in water, Kronotsky Nature Reserve, Kamchatka, Far East Russia

Igor Shpilenok / Panoramic view of Kronotsky River and Kronotsky Volcano with Kamchatka brown bear (Ursus arctos beringianus) fishing in the river, Kronotsky Zapovednik, Kamchatka, Far East Russia

Igor Shpilenok / Male Kamchatka Brown bear (Ursus arctos beringianus) marks trunk of Stone birch to denote territory during mating season, Valley of the Geysers, Kronotsky Zapovednik Reserve, Kamchatka, Russia.

Igor Shpilenok / Kamchatka Brown bear (Ursus arctos beringianus) peering into Igor's cabin, Valley of the Geysers Kronotsky Zapovednik Reserve, Kamchatka, Russia.

Igor Shpilenok / Kamchatka Brown bear (Ursus arctos beringianus) skirting a steaming thermal field, Valley of the Geysers, Kronotsky Zapovednik Reserve, Kamchatka, Russia.

Igor Shpilenok / Female Kamchatka Brown bear (Ursus arctos beringianus) crossing stream, Valley of the Geysers, Kronotsky Zapovednik Reserve, Kamchatka, Russia.

Igor Shpilenok / Wet Kamchatka Brown bear (Ursus arctos beringianus) standing to get a better view of spawning Salmon, Kronotsky River, Kronotsky Zapovednik Reserve, Kamchatka, Russia.

Igor Shpilenok / Kamchatka Brown bear (Ursus arctos beringianus) walking along the Valley of the Geysers, Kronotsky Zapovednik Reserve, Kamchatka, Russia.

Igor Shpilenok / Kamchatka Brown bear (Ursus arctos beringianus) cubs playing in snow, Kronotsky Zapovednik Reserve, Kamchatka, Russia.

Pete Oxford / Aerial shot of Kamchatka Brown bear walking across snow {Ursus arctos beringianus} Kamchatka, Russia

Igor Shpilenok / Kamchatka Brown bear (Ursus arctos beringianus) mother standing with cub, Valley of the Geysers, Kronotsky Zapovednik Reserve, Kamchatka, Russia.

Igor Shpilenok / Kamchatka Brown bear (Ursus arctos beringianus) leaping for Calico salmon during spawning season, Kronotsky River, Kronotsky Zapovednik Reserve, Kamchatka, Russia.

Igor Shpilenok / Kamchatka Brown bear (Ursus arctos beringianus) resting on warm ground next to thermal waters, Valley of the Geysers, Kronotsky Zapovednik Reserve, Kamchatka, Russia.

Igor Shpilenok / Kamchatka Brown bear (Ursus arctos beringianus) head underwater looking for Salmon underwater, Kronotsky River, Kronotsky Zapovednik Reserve, Kamchatka, Russia.

Igor Shpilenok / Kamchatka Brown bear (Ursus arctos beringianus) standing on rear legs, Kamchatka, Kronotsky Zapovednik Reserve, Russia.

Igor Shpilenok / Kamchatka Brown bear (Ursus arctos beringianus) footprint in mud, Koryaksky Zapovednik, Russia.

Michio Hoshino / Brown Bear (Ursus arctos) at waters edge, Kamchatka, Russia

Michio Hoshino / Brown Bear (Ursus arctos) sleeping, Kamchatka, Russia

Sergey Gorshkov / Brown Bear (Ursus arctos) standing in river, Kamchatka, Russia

Sergey Gorshkov / Brown Bear (Ursus arctos) in river, Kamchatka, Russia

Sergey Gorshkov / Brown Bear (Ursus arctos) mother and cubs swimming towards coast, Kamchatka, Russia

Sergey Gorshkov / Brown Bear (Ursus arctos) cub confronting two Domestic Dogs (Canis familiaris), Kamchatka, Russia

Sergey Gorshkov / Brown Bear (Ursus arctos)eyeing photographer Sergey Gorshkov, Kamchatka, Russia

Sergey Gorshkov / Brown Bear (Ursus arctos), at dock with Domestic Dogs (Canis familiaris) Kamchatka, Russia

Sergey Gorshkov / Brown Bear (Ursus arctos) with boat, Kamchatka, Russia

Igor Shpilenok / Igor Shpilenok photographing Kamchatka brown bear (Ursus arctos beringianus) fishing in river, Kamchatka, Far East Russia, photograph by Vasily Maksimov, August 2008

Igor Shpilenok / Igor Shpilenok photographing Kamchatka brown bear (Ursus arctos beringianus) amongst geysers, Kamchatka, Far East Russia, photograph by Ivan Seredkin

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) grazing on grass beside rocks and geothermal activity, Kamchatka, Far east Russia, January

Sergey Gorshkov / Large number of Kamchatka Brown bears (Ursus arctos beringianus) fishing for salmon in river, Kamchatka, Far east Russia, July

Sergey Gorshkov / Several Kamchatka brown bears (Ursus arctos beringianus) on snowy hillside, Kamchatka, Far east Russia, May

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) walking across autumn landscape, Kamchatka, Far east Russia, September 2005

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) fishing for salmon in river, Kamchatka, Far east Russia, July

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) with head resting on salmon caught in river, Kamchatka, Far east Russia, July

Sergey Gorshkov / Kamchatka brown bear (Ursus arctos beringianus) reaching up to browse on spring vegetation, Kamchatka, Far east Russia, June

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) two bears standing in and beside river looking for salmon, Kamchatka, Far east Russia, August

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) with head resting on salmon caught in river, Kamchatka, Far east Russia, July

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) bathing in water pool beside area of geothermal activity, Kamchatka, Far east Russia, January 2005

Sergey Gorshkov / Two Kamchatka Brown bears (Ursus arctos beringianus) walking along path towards building, Kamchatka, Far east Russia, August 2006

Sergey Gorshkov / Kamchatka brown bear (Ursus arctos beringianus) mother bear and three cubs outside den in rocks, Kamchatka, Far east Russia, June

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) with paw raised on rocks on coast, Kamchatka, Far east Russia, July

Sergey Gorshkov / Sergey Gorshkove photographing Kamchatka Brown bear (Ursus arctos beringianus) fishing in river beside snow field, Kamchatka, Far east Russia, July

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) sitting on rock in river, fishing, Kamchatka, Far east Russia, July

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) on shore beside boat, tents and wooden cottage, Kamchatka, Far east Russia, August 2005

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) mother and two cubs beside water, mother sniffing the air for danger, Kamchatka, Far east Russia, August

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) carrying salmon caught in river, Kamchatka, Far east Russia, July

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) leaping, fishing for salmon in river, Kamchatka, Far east Russia, July

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) with light coloured coat, sitting beside river, Kamchatka, Far east Russia, August

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) leaping, fishing for salmon in river, Kamchatka, Far east Russia, July

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) sitting on shore beside lake Kuril with volcano in background, Kamchatka, Far east Russia, August 2005

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) standing on rock in river, fishing, Kamchatka, Far east Russia, July

Sergey Gorshkov / Photographer Sergey Gorshkov's camp with tents and helicopter, surrounded by fence for protection against bears, Kamchatka, Far east Russia, July 2005

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) beside water, seagulls flying away, Kamchatka, Far east Russia, August 2009

Sergey Gorshkov / Kamchatka brown bear (Ursus arctos beringianus) on rocks beside water, Kamchatka, Far east Russia, May

Sergey Gorshkov / Two Kamchatka Brown bears (Ursus arctos beringianus) squabbling beside river, Kamchatka, Far east Russia, July

Sergey Gorshkov / Kamchatka brown bear (Ursus arctos beringianus) greeting at entrance to den in rocks, Kamchatka, Far east Russia, May

Sergey Gorshkov / Photographer photographing Kamchatka Brown bear (Ursus arctos beringianus) mother and two cubs beside Lake Kuril, Kamchatka, Far east Russia, August 2008

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) crossing snow field, Kamchatka, Far east Russia, January

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) feeding on salmon caught in river, Kamchatka, Far east Russia, July

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) standing beside lake looking for salmon, Kamchatka, Far east Russia, August

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) feeding on salmon caught in river, Kamchatka, Far east Russia, July

Sergey Gorshkov / Kamchatka brown bear (Ursus arctos beringianus) mother and three cubs climbing out of lake onto rocky shore, Kamchatka, Far east Russia, June

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) mother rolling over on back for baby to suckle, Kamchatka, Far east Russia, August

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) mother rolling over on back for baby to suckle, Kamchatka, Far east Russia, August

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) resting on edge of snow field, Kamchatka, Far east Russia, July

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) two families, one with two cubs, one with four cubs, walking beside water, Kamchatka, Far east Russia, August

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) ) walking over edge of snow field with volcano in background, Kamchatka, Far east Russia, July

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) walking over grassland, Kamchatka, Far east Russia, September

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) feeding on salmon caught in river, Kamchatka, Far east Russia, August

Sergey Gorshkov / Salmon (Salmonidae) migrating to spawn in Lake Kuril, preyed on by Kamchatka Brown bear (Ursus arctos beringianus) Kamchatka, Far East Russia, August

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) carrying salmon caught in river, Kamchatka, Far east Russia, July

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) emerging from river with caught salmon, Kamchatka, Far east Russia, July

Sergey Gorshkov / Kamchatka brown bear (Ursus arctos beringianus) walking over snow, Kamchatka, Far east Russia, May

Sergey Gorshkov / Kamchatka Brown bear (Ursus arctos beringianus) walking over rocks in river, fishing for salmon, Kamchatka, Far east Russia, July