Steven Kazlowski / Polar bear (Ursus maritimus) young bear rolling around in the snow, on newly formed pack ice during autumn freeze up, Beaufort Sea, off Arctic coast, Alaska

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

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.

Steven Kazlowski,Steven Kazlowski / Polar bear (Ursus maritimus) 4-5 year-old on pack ice, low angle shot, off the 1002 area of the Arctic National Wildlife Refuge, North Slope of the Brooks Range, Alaska, Beaufort Sea, autumn

Claudio Contreras,Claudio Contreras / Crocodile Flatheadfish (Cymbacephalus beauforti), Inanuran Island, Danajon Bank, Central Visayas, Philippines, April

Steven Kazlowski / Polar bear (Ursus maritimus) climbing onto an iceberg with Arctic terns {Sterna paradisaea} flying overhead, Beaufort Sea, Arctic Ocean, Alaska

Michele Westmorland / Beaufort's Crocodilefish (Cymbacephalus beauforti) camouflaged on coral reef, House Reef at the Jetty, Tufi, Oro Province, Papua New Guinea

Sylvain Cordier / Polar bear (Ursus maritimus), female with two cubs, on a barrier island outside Kaktovik, Alaska, USA.

Sylvain Cordier / Polar Bear (Ursus maritimus), two juveniles play fighting, Kaktovik, Alaska, USA.

Bert Willaert / Crocodile Flathead (Cymbacephalus beauforti), Kimbe Bay, West New Britain, Papua New Guinea

Steven Kazlowski / Polar bear (Ursus maritimus) head profile of young female, Beaufort Sea, off Arctic coast, Alaska

Steven Kazlowski / Autumn sunrise over the eastern Beaufort Sea, off Arctic coast, Alaska