Zebra, Boteti River, Botswana

Cowboy during winter roundup, Kalispell, Montana

Cowboys during winter roundup, Kalispell, Montana

Four gauchos drive a group of cows inside a lagoon of the Estancia Buena Vista at dusk, Esquina, Corrientes, Argentina.

Africa, African elephant, Amboseli National Park. African elephants and trees

Enasoit, Laikipia, Kenya, a family of African elephant.

Giraffe, Kalahari Desert, Botswana

Zambia, Kafue National Park, Busanga Plains. A herd of elephants moving through dry, dusty terrain in the late afternoon

Zambia, Kafue National Park, Busanga Plains. A herd of elephants led by a matriarch on the move in the late afternoon

Africa, Namibia, Etosha National park. Elephants at the waterhole of Okaukuejo.

USA, Wyoming, Shell, Horses in the Cold (PR)

Kenya, Maasai Mara National Game Reserve, Musiara Marsh. Zebras gather in large herds as they migrate through the Reserve at the beginning of the dry season.

Goat herd and yurts, Altai Mountains, Mongolia

France, Provence, Camargue, A guardian and white Camargue horses reflected in a calm lake

Kenya, Taita-Taveta County, Tsavo East National Park. A herd of elephants moves in single file.

Kenya, Taita-Taveta County, Tsavo East National Park. A herd of African elephants moves in single file.

Kenya, Kajiado County, Amboseli National Park. A herd of African elephants on the move.

Black bulls of Camargue and their herders running through the water, Camargue, France

Camargue white horses galloping through water, Camargue, France

Camargue white horses galloping through water, Camargue, France

Norway, Arctic, Svalbard, Nordaustlandet, Torelineset. A herd of Atlantic walruses lazing on a beach. These moustached, long-tusked marine mammals are found near the Arctic circle.

Kenya, Masai Mara, Musiara Marsh, Narok County. A herd of female Impalas accompanied by a territorial male at dawn.

Kenya, Masai Mara, Narok County. A herd of male and female Masai Giraffe making their way across the plains.

Kenya, Masai Mara, Musiara Marsh, Narok County. Elephant calves playing. Their permanent tusks emerge in their third year.

Tanzania, Tarangire National Park; Masailand. Bull elephants at waterhole in acacia woodland responding to the approach of other elephants.

Africa, Namibia, Caprivi, Bwa Bwata National Park, A herd of elephants drinking at the Kwando River

Herd of plains zebra, Ngorongoro Crater, Tanzania

Approaching Indian Elephant herd,Corbett National Park, India

Indian Elephants in the grassland,Corbett National Park, India

USA, Wyoming, Grand Teton NP, elk or Wapiti herd (Cervus elaphus)

Kenya, Masai Mara, Masai Mara Game Reserve. Two hot air balloons float over the plains in Masai Mara Game Reserve while herds of wildebeest graze below.

A herd of elephants drinking at a waterhole in Tsavo West National Park, Kenya

A herd of Masai giraffes at sunset in the Masai Mara National Reserve.

A herd of elephants with Mount Kilimanjaro in the background.

Rounding up Yilki horses, Cappadocia, Nevsehir Province, Central Anatolia, Turkey

Yilki horses, Cappadocia, Nevsehir Province, Central Anatolia, Turkey

Yilki horses, Cappadocia, Nevsehir Province, Central Anatolia, Turkey

Desert-adapted African Elephant (Loxodonta africana) herd with calves, walking in dry riverbed in the Hoanib desert, Kaokoland, Namibia

Desert-adapted African Elephant (Loxodonta africana) herd with calves, walking in dry riverbed in the Hoanib desert, Kaokoland, Namibia