Adult Dall sheep (Ovis dalli) in Denali National Park, Alaska, United States of America

Adult Svalbard reindeer (Rangifer tarandus platyrhynchus) grazing within the town limits of Longyearbyen, Svalbard, Norway

Adult Svalbard reindeer (Rangifer tarandus platyrhynchus) grazing within the town limits of Longyearbyen, Svalbard, Norway

Donkeys at eco-lodge Hara Oasis on River Draa banks in large palm grove, Agdz at foot of Djebel Kissane (Mount Kissane), Draa-Tafilet region, Morocco

A small group of introduced reindeer (Rangifer tarandus) before eradication in Stromness Bay, South Georgia, Polar Regions

An adult bull introduced reindeer (Rangifer tarandus) before eradication in Stromness Bay, South Georgia, Polar Regions

Herd of alpacas, Pitumarca District, Cusco (Cuzco) Region, Peru, South America

Adult Svalbard reindeer (Rangifer tarandus platyrhynchus) grazing on tundra in the Svalbard Archipelago, Norway, Arctic, Europe

Two Welsh Mountain Sheep at Croesor Mine, Cwm Croesor, Snowdonia National Park (Eryri), North Wales, United Kingdom, Europe

Close-up of two deer in Nara, Honshu, Japan

Adult Svalbard reindeer (Rangifer tarandus platyrhynchus) grazing within the town limits of Longyearbyen, Spitsbergen, Svalbard, Norway, Arctic, Europe

Adult Svalbard reindeer (Rangifer tarandus platyrhynchus) grazing on tundra in the Svalbard Archipelago, Norway, Arctic, Europe

Wild horses in the Sierra Nevada mountains near Pico del Veleta, Granada Province, Andalusia, Spain, Europe

Adult Svalbard reindeer (Rangifer tarandus platyrhynchus) grazing within the town limits of Longyearbyen, Spitsbergen, Svalbard, Norway, Arctic, Europe