Nick Garbutt / American bison (Bison bison) female covered in hoar frost near hot spring, portrait. Midway Geyser Basin, Yellowstone National Park, USA. February.

Heather Angel / Giant panda (Ailuropoda melanoleuca) portrait, in falling snow. Captive bred, in enclosure, Panda Breeding Centre, Wolong, Sichuan Province, China. February 2008.

SCOTLAND: The Big Picture / Red deer (Cervus elaphus) stag in upland landscape. Lochcarron, Highlands, Scotland, UK.

Sebastian Kennerknecht / American Bison (Bison bison) female in winter, Yellowstone National Park, Wyoming

Anup Shah / African Elephant (Loxodonta africana) herd during storm, Masai Mara, Kenya

Anup Shah / African Elephant (Loxodonta africana) herd during storm, Masai Mara, Kenya

Matthias Breiter / Polar Bear (Ursus maritimus) male resting on ice, Hudson Bay, Manitoba, Canada

Matthias Breiter / Polar Bear (Ursus maritimus) yearling cub, Hudson Bay, Manitoba, Canada

Matthias Breiter / Polar Bear (Ursus maritimus) male in snowstorm, Hudson Bay, Manitoba, Canada

Matthias Breiter / Polar Bear (Ursus maritimus) males in snowstorm, Hudson Bay, Manitoba, Canada

Matthias Breiter / Polar Bear (Ursus maritimus) male, Hudson Bay, Manitoba, Canada

Pedro Narra / Green turtle (Chelonia mydas) resting in the shallows of the coast, Bijagos Islands, Guinea Bissau. Endangered species.