Denis-Huot,Denis-Huot / Grant's zebra (Equus burchelli boehmi) herd with large cloud above, Amboseli National Park, Kenya

Philippe Clement / Domestic cows (Bos taurus) and free roaming horses grazing in the Pyrenees-Atlantiques, Pyrenees, France, June

Charlie Summers / American bison (Bison bison) herd roaming the plains, Custer State Park, South Dakota, USA, September

Angelo Gandolfi / A wild Grey Wolf (Canis lupus) roaming on the outskirts of a village at night, Tuscany "Maremma" Italy.

Shin Yoshino / African Elephant (Loxodonta africana) pair roaming grasslands in front of Mt Kilimanjaro, Tanzania

Sumio Harada / American Bison (Bison bison) free roaming wild herd along river, Yellowstone National Park, North America

Jabruson / Mountain gorilla asleep {Gorilla beringei} Virunga NP, Democratic Republic of Congo. "Rafiki" killed by roaming militia after Rwandan crisis.

Jabruson / Young Mountain gorilla {Gorilla beringei} peers into camera, Virunga NP, Dem Rep of Congo. Silverback "Rugabo" in background was killed by militia roaming the park during the Rwandan refugee crisis.

Neil Aldridge / Footprint of a free-roaming African Wild Dog (Lycaon pictus) in sand on farmland bordering Mapungubwe National Park, Limpopo Province, South Africa.

Andy Rouse / Wildebeest (Connochaetes taurinus) during migration, with setting sun, Masai Mara, Kenya, Africa. August.

Philippe Clement / Shepherd and tourists herding flock of sheep (Ovis aries) to pasture up in the mountains along the Col du Soulor, with free roaming horses, Hautes-Pyrenees, Pyrenees, France, June 2012

Diane McAllister / Portrait of a wild horse mare and her colt (Equus caballa) roaming on hills near Placitas. New Mexico, USA, February.