Roland Seitre / Svalbard Reindeer (Rangifer tarandus platyrhynchus) male and females running, Spitsbergen, Svalbard, Norway

Roland Seitre / Svalbard Reindeer (Rangifer tarandus platyrhynchus) pair, Spitsbergen, Svalbard, Norway

Roland Seitre / Svalbard Reindeer (Rangifer tarandus platyrhynchus) male, Spitsbergen, Svalbard, Norway

Colin Monteath / Caribou (Rangifer tarandus) and Tsataan reindeer herders in winter camp, Hunkher Mountains, northern Mongolia

Mark Raycroft / Caribou (Rangifer tarandus) bull on autumn tundra

Steve O. Taylor (GHF) / Rocky landscape of northern Niger, 2005.

Laurent Geslin / Indian gazelle (Gazella bennetti) Thar desert, Rajasthan, India

Eric Dragesco / Wild male Snow Leopard (Panthera uncia) running down barren mountainside with snow covered patches, Altai mountains, Mongolia. February

Eric Dragesco / Wild male Snow Leopard (Panthera uncia) running down barren mountainside with snow covered patches, Altai mountains, Mongolia. February

Michael Quinton / Caribou (Rangifer tarandus) pair running in snow, Alaska

David Noton / Person walking along sand dunes, Namib Desert, Namibia, Southern Africa. Model released.

Eric Baccega / Aerial view of Devon Island, Nunavut, Canada, June 2012.