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 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

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

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

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

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

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

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

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