Polar bear (Ursus maritimus) mother and two cubs walk across a snow-covered landscape. Churchill, Canada. Polar bears are threatened by climate change.
A polar bear (Ursus maritimus) sniffs the snow beside a tundra buggy full of tourists near Hudson Bay, near Churchill, Manitoba, Canada
Polar Bear, Svalbard, Norway
Polar bear (Ursus maritimus) standing upright, on his hind legs, and sniffing the air, Spitsbergen, Svalbard, Norway.
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