Pal Hermansen / Inuit sled dogs resting, near Ittoqortoormiit, Scoresbysund, Greenland. Second Prize in the Nature category of the Spider Black and White Photography Competition 2015.

Laurent Geslin / Sled dog leaping into the air, Canada

Franco Banfi / Portrait of Siberian Husky dog face used as sled dogs inside Riisitunturi National Park, Lapland, Finland

Bryan and Cherry Alexander / Inuit hunter travelling by dog sled during the polar night. Northwest Greenland, 1987. 40 BELOW bookplate.

Bryan and Cherry Alexander / Khanty herder standing on sled, with Reindeer / Caribou (Rangifer tarandus). Khanty Mansiysk, Western Siberia, Russia, 2000.

Bryan and Cherry Alexander / Nenets boy pulling younger child on a sled. Yamal, Western Siberia, Russia, 2001.

Bryan and Cherry Alexander / Dolgan reindeer / caribou herder's balok (wooden hut built on sled runners) with chimney smoking. Taymyr, Northern Siberia, Russia, 2004.

Bryan and Cherry Alexander / Dolgan family of reindeer / caribou herders having meal together inside their balok (moveable hut built on sled runners). Taymyr, Northern Siberia, Russia, 2004.

Niall Benvie / Man pulling a sledge, in winter landscape, snow on conifer trees in boreal forests, Riisitunturi National Park, Finland, February 2009

Jerry Monkman / Young boys sledding at Wagon Hill Farm in Durham, New Hampshire, USA, January 2009. Model released.

Jerry Monkman / Young girls sledding at Wagon Hill Farm in Durham, New Hampshire, USA, January 2009. Model released.

Jerry Monkman / Young boys sledding at Wagon Hill Farm in Durham, New Hampshire, USA, January 2009. Model released.