Denis-Huot / Masai giraffe (Giraffa camelopardalis tippelskirchi) herd at sunrise, Masai-Mara Game Reserve, Kenya. November.

Ingo Arndt / American Bison (Bison bison) herd grazing on a hillside, South Dakota, USA

Ingo Arndt / American Bison (Bison bison) herd stampeding, South Dakota, USA

Wim van den Heever / Springbok (Antidorcas marsupialis) herd reflected in waterhole. Etosha National Park, Namibia, June.

Jeff Vanuga / White horses of the Camargue galloping through marshes in the Camargue, France. April.

Jeff Vanuga / White horses of the Camargue galloping through marshes in the Camargue, France. April.

Eric Baccega / African elephant (Loxodonta africana) herd with calves, walking in procession to a waterhole in sand storm, Etosha National Park, Namibia, Africa

Wim van den Heever / Blue wildebeest (Connochaetes taurinus) herd during migration, Masai Mara, Kenya.

Wim van den Heever / Gemsbok (Oryx gazella) viewed from above, Namib Desert, Namibia.

Gerrit Vyn / Pronghorns (Antilocapra americana) crawling under fence in snow during migration, Sublette County, Wyoming, USA. March.

Sharon Heald / African elephant (Loxodonta africana) herd silhouetted at sunset, Chobe National Park, Botswana.

Arne Hodalic / Nenet herdsman with Reindeer (Rangifer tarandus) during summer migration, Yamal Peninsula, Russia. May.