Steven Kazlowski / Polar bear (Ursus maritimus) curious young 2-year-old in water off a barrier island, 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska
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Steven Kazlowski / Polar bear (Ursus maritimus) curious young 2-year-old in water off a barrier island, its mother on the beach behind, Bernard Spit, 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska
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Steven Kazlowski / Polar bear (Ursus maritimus) curious young 2-year-old in water off a barrier island, its mother on the beach, Bernard Spit, 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska
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D. Parer & E. Parer-Cook / One Tree Island and reef, Capricorn-Bunker group, Great Barrier Reef Marine Park, Queensland, Australia
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Steven Kazlowski / Polar bear (Ursus maritimus) female with cubs aged two years, along a barrier island during fall freeze up, Barter Island, 1002 area of the Arctic National Wildlife Refuge, Alaska
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Steven Kazlowski / Polar bears (Ursus maritimus) female with cubs aged two years travelling along a barrier island during autumn freeze up, Bernard Spit, 1002 area of the Arctic National Wildlife Refuge, Alaska
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Steven Kazlowski / Photographers photographing of a group of curious Polar bears (Ursus maritimus) from motorboats along a barrier island during autumn freeze up, Barter Island, 1002 area of the Arctic National Wildlife...
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Steven Kazlowski / Polar bear (Ursus maritimus) young male playing / rolling around in the snow along a barrier island during autumn freeze up, Bernard Spit, 1002 area of the Arctic National Wildlife Refuge, Alaska
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Steven Kazlowski / Polar bear (Ursus maritimus) portrait of curious young male, covered in snow from rolling around / playing. On a barrier island during autumn freeze up, Bernard Spit, 1002 area of the Arctic National...
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Steven Kazlowski / Polar bear (Ursus maritimus) young boar playing / rolling around in the snow along a barrier island during autumn freeze up, Bernard Spit, 1002 area of the Arctic National Wildlife Refuge, Alaska
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Steven Kazlowski / Polar bear (Ursus maritimus) footprints in the snow along a barrier island during autumn freeze up, Bernard Spit, 1002 area of the Arctic National Wildlife Refuge, Alaska. October 2009
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Juergen Freund / Fred Gurgel organizing his algae / seaweed specimens, as part of the Coral Reef census, Lizard Island, Queensland, Australia, April 2008