Danny Green / Grizzly Bear (Ursus arctos) eating a fish, Lake Clarke National Park, Alaska, August

Philippe Clement / Juvenile European brown bear cub (Ursus arctos arctos) walking in deep snow in winter, Bavarian Forest National Park, Germany, January. Captive.

Philippe Clement / European brown bear (Ursus arctos arctos) cubs suckling from mother in the snow in winter, Bavarian Forest National Park, Germany, January. Captive.

Ingo Arndt / Grizzly Bear / Coastal Brown Bear (Ursus arctos horribilis) mother with two spring cubs, one riding on her back, Lake Clark National Park, Alaska, USA. June.

Ingo Arndt / Grizzly bear (Ursus arctos horribilis) picture taken with a remote camera car, Alaska, July.

Ingo Arndt / Grizzly bear (Ursus arctos horribilis) silhouette, Lake Clark National Park, Alaska

Ingo Arndt / Grizzly bear (Ursus arctos horribilis) silhouette at sunset, Lake Clark National Park, Alaska, USA, July.

Ingo Arndt / Grizzly bear (Ursus arctos horribilis) mother with two cubs catching salmon, Lake Clark National Park, Alaska, USA, September

Ingo Arndt / Grizzly bear (Ursus arctos horribilis) portrait, Lake Clark National Park, Alaska, USA, September.

Ingo Arndt / Grizzly Bear (Ursus arctos horribilis) waiting for salmon under moonlit sky, Lake Clark National Park, Alaska, USA, August

Ingo Arndt / Grizzly Bear (Ursus arctos horribilis) waiting for salmon at full moon, Lake Clark National Park, Alaska, USA, August

Ingo Arndt / Grizzly Bear (Ursus arctos horribilis) two cubs resting, Lake Clark National Park, Alaska, USA, August