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Polar bear (Ursus maritimus) sow walking on a barrier island during autumn freeze up, Bernard Spit, North Slope, Arctic coast of Alaska, September
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Steven Kazlowski / Polar bear (Ursus maritimus) sow walking on a barrier island during autumn freeze up, Bernard Spit, North Slope, Arctic coast of Alaska, September
Polar bear (Ursus maritimus) sow with a pair of cubs walk on a barrier island during autumn freeze up, Bernard Spit, North Slope, Arctic coast of Alaska, September
01469277
Steven Kazlowski / Polar bear (Ursus maritimus) sow with a pair of cubs walk on a barrier island during autumn freeze up, Bernard Spit, North Slope, Arctic coast of Alaska, September
Polar bear (Ursus maritimus) sow with a pair of cubs walk on a barrier island during autumn freeze up, Bernard Spit, North Slope, Arctic coast of Alaska, September
01469276
Steven Kazlowski / Polar bear (Ursus maritimus) sow with a pair of cubs walk on a barrier island during autumn freeze up, Bernard Spit, North Slope, Arctic coast of Alaska, September
Hills in the Lamar Valley, in snow, Yellowstone National Park, Wyoming, USA, February 2013.
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Kirkendall-Spring / Hills in the Lamar Valley, in snow, Yellowstone National Park, Wyoming, USA, February 2013.
Colorful layers of rock on the inside of Mount St Helens' crater, seen from the rim. Washington, USA. May 2013
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Floris van Breugel / Colorful layers of rock on the inside of Mount St Helens' crater, seen from the rim. Washington, USA. May 2013
Polar bear (Ursus maritimus) curious young boar on the newly frozen pack ice reaches for remote camera with paw, Beaufort Sea, off the 1002 area of the Arctic National Wildlife Refuge, North Slope, Al...
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Steven Kazlowski / Polar bear (Ursus maritimus) curious young boar on the newly frozen pack ice reaches for remote camera with paw, Beaufort Sea, off the 1002 area of the Arctic National Wildlife Refuge, North Slope, Al...
Polar bear (Ursus maritimus) curious young male on the newly frozen pack ice, Beaufort Sea, off the 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska
01431476
Steven Kazlowski / Polar bear (Ursus maritimus) curious young male on the newly frozen pack ice, Beaufort Sea, off the 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska
Polar bear (Ursus maritimus) juvenile spreading body weight over thin newly forming pack ice, trying not to break through, Beaufort Sea, off the 1002 area of the Arctic National Wildlife Refuge, North...
01431445
Steven Kazlowski,Steven Kazlowski / Polar bear (Ursus maritimus) juvenile spreading body weight over thin newly forming pack ice, trying not to break through, Beaufort Sea, off the 1002 area of the Arctic National Wildlife Refuge, North...
Polar bear (Ursus maritimus) 3-year-olds play fighting on newly formed pack ice, Beaufort Sea, off the 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska
01431421
Steven Kazlowski / Polar bear (Ursus maritimus) 3-year-olds play fighting on newly formed pack ice, Beaufort Sea, off the 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska
Polar bear (Ursus maritimus) juvenile rolling  around on newly formed pack ice, Beaufort Sea, off the 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska
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Steven Kazlowski,Steven Kazlowski / Polar bear (Ursus maritimus) juvenile rolling around on newly formed pack ice, Beaufort Sea, off the 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska
Polar bear (Ursus maritimus) portrait, female. Bernard Spit, 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska.
01431378
Steven Kazlowski,Steven Kazlowski / Polar bear (Ursus maritimus) portrait, female. Bernard Spit, 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska.
Polar bear (Ursus maritimus) curious adult head underwater, Beaufort Sea, off the 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska.
01431377
Steven Kazlowski,Steven Kazlowski / Polar bear (Ursus maritimus) curious adult head underwater, Beaufort Sea, off the 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska.