Mark Raycroft / White-tailed Deer (Odocoileus virginianus) buck in winter

Duncan Usher / Common Buzzard (Buteo buteo) pair fighting over food in winter, Germany

Mark Raycroft / Alaskan Malamute (Canis familiaris) in snow wearing pack

Konrad Wothe / Siberian Tiger (Panthera tigris altaica) walking in snow, Siberian Tiger Park, Harbin, China

Jami Tarris / Caribou (Rangifer tarandus) herders leading herd in winter, Khovsgol, Mongolia

Mark Raycroft / Siberian Husky (Canis familiaris) in winter, North America

Mark Raycroft / American Marten (Martes americana) in winter, North America

Mark Raycroft / Pronghorn Antelope (Antilocapra americana) herd crossing fence in winter, North America

Mark Raycroft / Pronghorn Antelope (Antilocapra americana) group in winter, North America

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) buck with one antler in winter, North America

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) buck in winter, North America

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) buck in winter, North America