David Woodfall / Aerial view of pancake ice sheet cracking and melting in Hudson Bay, Manitoba, Canada, December 2004
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Eric Baccega / Polar Bear (Ursus maritimus) mother with her 3-month cub, soon after emerging from their hibernation den. Wapusk National Park, Manitoba, Canada, March.
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Eric Baccega / Polar Bear (Ursus maritimus) mother resting while her 3-month cubs play. Wapusk National Park, Manitoba, Canada, March.
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Bryan and Cherry Alexander / Polar bear (Ursus maritimus) on sea ice in wind. Churchill, Manitoba, Canada.
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Bryan and Cherry Alexander / Polar bear (Ursus maritimus) mother and cubs with Parhelion / sun dogs over sea ice. Churchill, Manitoba, Canada.
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Eric Baccega / Two Polar bears (Ursus maritimus) standing upright, fighting, Churchill, Manitoba, Canada
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Matthias Breiter / Polar Bear (Ursus maritimus) cooling off on a frozen lake, Churchill, Manitoba, Canada
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Inaki Relanzon / Two polar bears (Ursus maritimus) play fighting, Churchill, Hudson Bay, Manitoba, Canada. October 2005
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Warwick Sloss / Polar bear {Ursus maritimus} sniffing at occupants of filming vehicle, Churchill, Manitoba, Canada. Filming BBC's 'Nature's Great Events' 2007
Suzi Eszterhas / Polar Bear (Ursus maritimus) three to four month old cub peeking over mother's body while she is tranquilized by researchers, vulnerable, Wapusk National Park, Manitoba, Canada
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Matthias Breiter / Polar Bear (Ursus maritimus) three month old cub looking out of its birth den, vulnerable, Wapusk National Park, Manitoba, Canada
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Suzi Eszterhas / Polar Bear {Ursus maritimus} 3/4-months cubs peeking over mother who has been anaesthetised by biologists, Wapusk NP, Manitoba, Canada
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Suzi Eszterhas / Polar Bear {Ursus maritimus} anaesthetised 3/4-months cub held by biologist Nick Lunn during examination, Wapusk NP, Manitoba, Canada
