Theo Allofs / Burchell's Zebra (Equus burchellii) pair drinking at waterhole with Oryx (Oryx gazella) in background, NamibRand Nature Reserve, Namibia

Theo Allofs / Oryx (Oryx gazella) group drinking at waterhole, NamibRand Nature Reserve, Namibia

Ole Jorgen Liodden / Beisa oryx (Oryx beisa) fighting in rut. Samburu, Kenya, December.

Richard Du Toit / Gemsbok (Oryx gazella) running, Namib-Naukluft National Park, Namibia

Jim Brandenburg / Gemsbok (Oryx gazella) on sand dune, Namib Desert, Namibia

Jim Brandenburg / Gemsbok (Oryx gazella) running across sand dune, Namib Desert, Namibia

Jim Brandenburg / Gemsbok (Oryx gazella) on sand dune, Namib Desert, Namibia

Jim Brandenburg / Gemsbok (Oryx gazella) standing on dune, Namib Desert, Namibia

Jim Brandenburg / Gemsbok (Oryx gazella) trio running on sand dune, Namib Desert, Namibia

Jim Brandenburg / Gemsbok (Oryx gazella) walking across sand dune, Namib Desert, Namibia

Richard Du Toit / Oryx (Oryx gazella) herd in shade in desert, Kgalagadi Transfrontier Park, South Africa

Winfried Wisniewski / Oryx (Oryx gazella) males fighting, Kgalagadi Transfrontier Park, South Africa

Cyril Ruoso / Oryx (Oryx gazella) in desert, Namib-Naukluft National Park, Namibia

Cyril Ruoso / Oryx (Oryx gazella) group in desert, Namib-Naukluft National Park, Namibia

Yva Momatiuk & John Eastcott / Oryx (Oryx gazella) in desert, Sossusvlei, Namib-Naukluft National Park, Namibia

Yva Momatiuk & John Eastcott / Angolan Giraffe (Giraffa giraffa angolensis) and drinking Oryx (Oryx gazella) trio at waterhole in dry season, Etosha National Park, Namibia

Yva Momatiuk & John Eastcott / Blue Wildebeest (Connochaetes taurinus) and drinking Oryx (Oryx gazella) at waterhole in dry season, Etosha National Park, Namibia

Yva Momatiuk & John Eastcott / Oryx (Oryx gazella) male drinking at waterhole, Etosha National Park, Namibia

Yva Momatiuk & John Eastcott / Oryx (Oryx gazella) male and Impala (Aepyceros melampus) females drinking at waterhole in dry season, Etosha National Park, Namibia

Vincent Grafhorst / African Wild Dog (Lycaon pictus) pack feeding on Oryx (Oryx gazella) calf, Africa

Vincent Grafhorst / Oryx (Oryx gazella) mother near African Wild Dog (Lycaon pictus) pack who killed her calf, Africa

Vincent Grafhorst / Oryx (Oryx gazella) mother defending her already killed calf against African Wild Dog (Lycaon pictus) pack, Africa

Vincent Grafhorst / Oryx (Oryx gazella) mother defending her already killed calf against African Wild Dog (Lycaon pictus) pack, Africa

Vincent Grafhorst / Oryx (Oryx gazella) mother defending her already killed calf against African Wild Dog (Lycaon pictus) pack, Africa

Vincent Grafhorst / Oryx (Oryx gazella) mother defending her already killed calf against African Wild Dog (Lycaon pictus) pack, Africa

Vincent Grafhorst / Oryx (Oryx gazella) mother defending her already killed calf against African Wild Dog (Lycaon pictus), Africa

Vincent Grafhorst / Oryx (Oryx gazella) mother defending her already killed calf against African Wild Dog (Lycaon pictus) pair, Africa

Richard Du Toit / Oryx (Oryx gazella) pair running, Kgalagadi Transfrontier Park, South Africa

Richard Du Toit / Oryx (Oryx gazella) pair, Kgalagadi Transfrontier Park, South Africa

Richard Du Toit / Oryx (Oryx gazella) males fighting, Kgalagadi Transfrontier Park, South Africa

Wim van den Heever / Fringe-eared oryx (Oryx beisa callotis) female, looking back towards camera, OlDonyo, Kenya.

Constantinos Petrinos / Beisa oryx (Oryx beisa beisa) Awash National Park, Afar Region, Great Rift Valley, Ethiopia, Africa, March.

Constantinos Petrinos / Beisa oryx (Oryx beisa beisa) Awash National Park, Afar Region, Great Rift Valley, Ethiopia, Africa, March.

Denis-Huot / Grevy's zebra (Equus grevyi) and oryx (Oryx beisa) walking on a dry riverbed, Samburu Game Reserve, Kenya. March.

Mary McDonald / Beisa oryx (Oryx beisa beisa) mother with suckling baby, Samburu Game Reserve, Kenya. October.

Theo Allofs / Oryx (Oryx gazella) group drinking at waterhole, NamibRand Nature Reserve, Namibia

Theo Allofs / Oryx (Oryx gazella) males fighting, NamibRand Nature Reserve, Namibia

Theo Allofs / Oryx (Oryx gazella) group crossing desert, NamibRand Nature Reserve, Namibia

Vincent Grafhorst / Oryx (Oryx gazella) male, Namib Desert, Namibia

Loic Poidevin / East African Oryx (Oryx beisa) copulating. Samburu National Reserve, Kenya, October.

Loic Poidevin / East African Oryx (Oryx beisa) suckling young, Samburu National Reserve, Kenya , October

Jeff Vanuga / East African oryx (Oryx beisa) males fighting during rut, Samburu National Park, Kenya.

Richard Du Toit / Oryx (Oryx gazella) males fighting, Kgalagadi Transfrontier Park, South Africa

Pete Oxford / Oryx (Oryx gazella) on private game ranch, Great Karoo, South Africa

Eric Baccega / Beisa oryxes (Oryx beisa) mating, Samburu National Reserve, Kenya, Africa.

Eric Baccega / Beisa oryxes (Oryx beisa) mating, Samburu National Reserve, Kenya, Africa.

Eric Baccega / Male Beisa oryx (Oryx beisa) approaching female nursing calf, Samburu National Reserve, Kenya, Africa.

Eric Baccega / Beisa oryx (Oryx beisa) mating, with calf, Samburu National Reserve, Kenya, Africa.

Eric Baccega / Beisa oryx (Oryx beisa), Samburu National Reserve, Kenya, Africa.

Eric Baccega / Beisa oryx (Oryx beisa), Samburu National Reserve, Kenya, Africa.

Eric Baccega / Beisa oryx herd (Oryx beisa), Samburu National Reserve, Kenya, Africa.

Denis-Huot / Beisa oryx (Oryx beisa) males fighting, Samburu game reserve, kenya

Denis-Huot / Beisa oryx (Oryx beisa) males fighting, Samburu game reserve, kenya

Denis-Huot / Beisa oryx (Oryx beisa) adults and calves, Samburu game reserve, kenya

Theo Allofs / Oryx (Oryx gazella) in dry river bed in front of large sand dune, Hoarusib River, Namib Desert, Namibia

Theo Allofs / Oryx (Oryx gazella) herd in dry river bed in front of large sand dune, Hoarusib River, Namib Desert, Namibia

Winfried Wisniewski / Beisa Gemsbok (Oryx gazella beisa) mother nursing calf, Samburu-Isiolo Game Reserve, Kenya

Winfried Wisniewski / Beisa Gemsbok (Oryx gazella beisa) calf resting, Samburu-Isiolo Game Reserve, Kenya

Tui De Roy / East African Oryx (Oryx beisa), Borana Ranch, Kenya

Mary McDonald / Beisa Oryx (Oryx beisa) males fighting. Masai Mara Game Reserve, Kenya, East Africa.

Richard Du Toit / Gemsbok (Oryx gazella) herd on sand dune, Kgalagadi Transfrontier Park, Botswana

Richard Du Toit / Gemsbok (Oryx gazella) feeding on grass, Northern Cape, South Africa

Ole Jorgen Liodden / Beisa oryx (Oryx beisa) galloping at speed. Samburu, Kenya, December.

Ole Jorgen Liodden / Beisa oryx (Oryx beisa) fighting in rut. Samburu, Kenya, December.

Richard Du Toit / Gemsbok (Oryx gazella) herd running, Kalahari, Northern Cape, South Africa

Richard Du Toit / Gemsbok (Oryx gazella), Kalahari, Northern Cape, South Africa

Richard Du Toit / Gemsbok (Oryx gazella), Kalahari, Northern Cape, South Africa

Richard Du Toit / Gemsbok (Oryx gazella) herd, Kalahari, South Africa

Tui De Roy / Beisa Gemsbok (Oryx gazella beisa) herd, Solio Game Reserve, Kenya

Tui De Roy / Beisa Gemsbok (Oryx gazella beisa) calf, Solio Game Reserve, Kenya

Tui De Roy / Beisa Gemsbok (Oryx gazella beisa) pair, Mpala Research Centre, Kenya

Vincent Grafhorst / Gemsbok (Oryx gazella) group resting in shade of Camelthorn Acacia (Acacia erioloba), Nossob River, Kgalagadi Transfrontier Park, South Africa

Richard Du Toit / Gemsbok (Oryx gazella) pair, Kalahari, South Africa

Richard Du Toit / Gemsbok (Oryx gazella), Kalahari, South Africa

Richard Du Toit / Gemsbok (Oryx gazella), Kalahari, South Africa

Mary McDonald / Beisa oryx {Oryx beisa} Samburu NP, Kenya.

Mary McDonald / Beisa oryx {Oryx beisa} Samburu NP, Kenya.

Mary McDonald / Beisa oryx {Oryx beisa} feeding on a Weaver bird's nest, Samburu NP, Kenya.

ZSSD / South African Gemsbok (Oryx gazella gazella), native to Africa

Vincent Grafhorst / Gemsbok (Oryx gazella) pair, Deception Valley, Central Kalahari Game Reserve, Botswana

Vincent Grafhorst / Gemsbok (Oryx gazella) trio foraging in high Kalahari grass, Deception Valley, Central Kalahari Game Reserve, Botswana

Richard Du Toit / Gemsbok (Oryx gazella) on savanna, Kalahari Desert, South Africa

Richard Du Toit / Gemsbok (Oryx gazella), Kalahari Desert, South Africa

Richard Du Toit / Gemsbok (Oryx gazella) group on savanna, Kalahari, South Africa

Richard Du Toit / Gemsbok (Oryx gazella), Kalahari Desert, South Africa

Mike Wilkes / Beisa oryx (Oryx beisa) in grassland, Kenya

Bernard Castelein / Beisa oryx {Oryx gazella beisa} with young, Samburu NP, Kenya

Tony Heald / Beisa oryx {Oryx gazella beisa} young calf lying very still when threatened, Laikipia, Kenya

Anup Shah / Herd of Beisa oryx (Beisa oryx) grazing on savanna, Buffalo Springs NR, Kenya

Anup Shah / Beisa oryx with calves {Oryx beisa} Samburu GR, Kenya

Anup Shah / Beisa oryx with calves {Oryx beisa} Samburu GR, Kenya

Anup Shah / Herd of Beisa oryx in landscape {Oryx beisa} Samburu GR, Kenya

Richard Du Toit / Gemsbok (Oryx gazella) two rams fighting, Kgalagadi Transfrontier Park, South Africa

Jim Brandenburg / Gemsbok (Oryx gazella) running across desert, Namib Desert, Namibia

Jim Brandenburg / Gemsbok (Oryx gazella) running across desert landscape, Namibia

Jim Brandenburg / Gemsbok (Oryx gazella) skull on dune, Namib Desert, Namibia