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

Ole Jorgen Liodden / Oryx (Oryx gazella) in motion. Kalahari, Botswana, November.

Kim Taylor / Gemsbok (Oryx gazella) in profile against white background. Endemic to central and southern Africa.

Tony Heald / Gemsbok [Oryx gazella] two males fighting, Etosha National Park, Namibia, August

Christophe Courteau / Oryx (Oryx gazella) and Ostriches (Struthio camelus) running, Etosha National Park, Namibia, August 2009

Staffan Widstrand / Arabian oryx (Oryx leucoryx) two males fighting, Dubai Desert Conservation area, United Arab Emirates, February

Staffan Widstrand / Arabian Oryx (Oryx leucoryx) standing on sand dune, Dubai Desert Conservation Reserve, Dubai, Endangered species

Staffan Widstrand / Arabian oryx (Oryx leucoryx) head and horns above sand dune, Dubai Desert Conservation Reserve, Dubai, UAE, Endangered species

Staffan Widstrand / Arabian oryx (Oryx leucoryx) family, Dubai Desert Conservation Reserve, Dubai, UAE, Endangered species

Charlie Summers / Backlit Gemsboks (Oryx gazella gazella) at sunrise approach Etosha pan waterhole, Namibia, Southern Africa

Hanne & Jens Eriksen / Arabian oryx {Oryx leucoryx} calf being released into the wild after captivity, Abu Dhabi

Richard Du Toit / Aerial view of Gemsbok {Oryx gazella gazella} galloping across sand dunes, Namib Naukluft Park, Namibia

Kim Taylor / Gemsbok (Oryx gazella gazella) running in the Namib desert, Africa (digitally enhanced)

Hermann Brehm / Oryx in the dunes of the Namib Desert, Namibia. (Oryx gazella)

Mark Carwardine / Arabian / White oryx (Oryx leucoryx) Living Desert Zoo, Palm Desert, California, USA, Captive, Endangered or threatened species (Endangered)

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

Ole Jorgen Liodden / Oryx (Oryx gazella) looking back over its shoulder. Kalahari, Botswana, November.

Charlie Summers / Two Gemsboks (Oryx gazella) fighting, Kgalagadi TB Park of South Africa, May

Charlie Summers / Gemsbok (Oryx gazella) standing in golden stick grass early in the morning, Kgalagadi TB Park of South Africa, May

Charlie Summers / Gemsbok (Oryx gazella) herd in the Auob River bed that due to rains was full of Stick Grass, Kgalagadi TB Park of South Africa, May

Charlie Summers / Gemsbok (Oryx gazella) backlit in the late evening. Kgalagadi TB Park of South Africa, May

Christophe Courteau / Group of Oryx (Oryx gazella) running, Etosha National Park, Namibia, August 2009

Staffan Widstrand / Arabian oryx (Oryx leucoryx) male's head covered in vegetation during mating season, Dubai Desert Conservation Reserve, Dubai, UAE, Endangered species

Staffan Widstrand / Arabian oryx (Oryx leucoryx) male displaying flehmen response in mating season, Dubai Desert Conservation Reserve, Dubai, UAE, February

Staffan Widstrand / Arabian oryx (Oryx leucoryx) grazing on desert plant, Dubai Desert Conservation Reserve, Dubai, UAE, February

Staffan Widstrand / Arabian oryx (Oryx leucoryx) adult grazing with juvenile in background, Dubai Desert Conservation Reserve, Dubai, UAE, Endangered species

Staffan Widstrand / Arabian oryx (Oryx leucoryx) Dubai Desert Conservation Reserve, Dubai, UAE, Endangered species

Hanne & Jens Eriksen / Arabian oryx {Oryx leucoryx} male and female interacting before mating, Oman

Hanne & Jens Eriksen / Arabian oryx {Oryx leucoryx} in stony desert, Oman

Charlie Summers / Backlit Gemsbok (Oryx gazella gazella) at sunrise in the central Kalahari desert, Southern Africa

Chris Gomersall / Southern oryx / Gemsbok (Oryx gazella) in the Namib Desert, Sossusvlei, Namib Naukluft National Park, Namibia, Africa, November

Juan Carlos Munoz / Oryx {Oryx gazella} in the Namib desert, Namibia, August

Juan Carlos Munoz / Oryx {Oryx gazella} in the Namib desert, Namibia, August

Juan Carlos Munoz / Oryx {Oryx gazella} crosses the desert, Namib desert, Namibia, August

Juan Carlos Munoz / Oryx {Oryx gazella} in the Namib desert, Namibia, August

Juan Carlos Munoz / Oryx {Oryx gazella} crosses the desert, Namib desert, Namibia, August

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.

Hanne & Jens Eriksen / Arabian oryx {Oryx leucoryx} two fighting, Jiddat Al Harasis, Oman

Hanne & Jens Eriksen / Arabian oryx {Oryx leucoryx} mother with young calf, Jiddat Al Harasis, Oman

Hanne & Jens Eriksen / Arabian oryx {Oryx leucoryx} adults and young near desert vegetation, Jiddat Al Harasis, Oman

Hanne & Jens Eriksen / Arabian oryx {Oryx leucoryx} with satelite transmitter collar, being released into the wild after captivity, Abu Dhabi

Hanne & Jens Eriksen / Arabian oryx {Oryx leucoryx} four, some with satellite transmitter collar, being released into the wild after captivity, Abu Dhabi

Hanne & Jens Eriksen / Arabian oryx {Oryx leucoryx} with satelite transmitter collar, being released into the wild after captivity, Abu Dhabi

Hanne & Jens Eriksen / Arabian oryx {Oryx leucoryx} two, one with satelite transmitter collar, being released into the wild after captivity, Abu Dhabi

Hanne & Jens Eriksen / Arabian oryx {Oryx leucoryx} His Highness General Sheikh Mohammed bin Zayed Al Nahyan, Crown Prince of Abu Dhabi, watching the release of Arabian Oryx with satellite transmitter into the wild, Abu Dha...

Hanne & Jens Eriksen / Arabian oryx {Oryx leucoryx} His Highness General Sheikh Mohammed bin Zayed Al Nahyan, Crown Prince of Abu Dhabi, holding a calf before releasing it into the wild after captivity, Abu Dhabi

Hanne & Jens Eriksen / Arabian oryx {Oryx leucoryx} His Highness General Sheikh Mohammed bin Zayed Al Nahyan, Crown Prince of Abu Dhabi, with a calf before releasing it into the wild after captivity, Abu Dhabi

Jouan & Rius / Oryx (Oryx gazella) in the dunes, Kgalagadi Transfrontier Park, Kalahari desert, South Africa

Jouan & Rius / Oryx (Oryx gazella) in the dunes, Kgalagadi Transfrontier Park, Kalahari desert, South Africa

Pete Oxford / Oryx (Oryx gazella) feeding on Namib melon for its water content, Sossusvlei, Namibia, Africa

Hanne & Jens Eriksen / Arabian oryx {Oryx leucoryx} close-up, head only, Jiddat al Harasis, Oman

Tony Heald / Gemsbok / Oryx)males fighting (Oryx gazella gazella) Etosha NP Namibia

Tony Heald / Gemsbok drinking at waterhole. (Oryx gazella gazella) Etosha NP, Namiba, Southern Africa

Philippe Clement / Gemsbok (Oryx gazella gazella) licking crystallised minerals at dry waterhole, Kalahari desert, Kgalagadi Transfrontier Park, South Africa

Philippe Clement / Gemsbok (Oryx gazella gazella) among yellow flowers, Kalahari desert during the rainy season, Kgalagadi Transfrontier Park, South Africa

Philippe Clement / Gemsbok herd {Oryx gazella gazella} resting along dry riverbed of the Auob River, Kalahari desert, Kgalagadi Transfrontier Park, South Africa

Richard Du Toit / Aerial view of Gemsbok {Oryx gazella gazella} on sand dunes, Namib Naukluft NP, Namibia

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

Richard Du Toit / Gemsbok males fighting {Oryx gazella gazella} Kalahari Gemsbok NP, South Africa

Hermann Brehm / Oryx {Oryx gazella} browsing vegetation in dunes of Namib Desert, Namibia

Pete Oxford / Oryx portrait {Oryx gazella} Kgalagadi transfrontier Park, Kalahari, South Africa

Pete Oxford / Gemsbok {Oryx gazella} Sossusvlei, Namibia

Pete Oxford / Gemsbok scratching back with horn {Oryx gazella} Kgalagadi Transfrontier Park, South Africa

Pete Oxford / Gemsbok (Oryx gazella) mating at waterhole, Etosha NP, Namibia, Southern Africa

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

Hermann Brehm / Oryx {Oryx gazella} walking over sand dunes, Namibia

Pete Oxford / Gemsbok {Oryx gazella} in landscape, Kgalagadi transfrontier NP, South africa

Pete Oxford / Gemsbok {Oryx gazella} Kgalagadi transfrontier NP, South africa

Pete Oxford / Gemsbok {Oryx gazella gazella} two males fighting, Etosha NP, Namibia

Hermann Brehm / Oryx (Oryx gazella) walking across the dunes of the Namib Desert, Namibia.

Flip de Nooyer / Solitary Oryx / Gemsbok grazing in desert {Oryx gazella} massive sand dunes behind, Namibia

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

Philippe Clement / Two gemsbok (Oryx gazella gazella) walking on dune, Kgalagadi NP, Kalahari desert, South Africa

Philippe Clement / Gemsbok (Oryx gazella gazella) carcass in Kalahari desert showing skull with horns and skeleton, Kgalagadi NP, South Africa

Hanne & Jens Eriksen / Arabian Oryx {Oryx leucoryx} mother (tagged) with calf in temporary enclosure, Jaaluni, Oman captive

Mike Potts / Arabian oryx {Oryx leucoryx} Hawar Is, Bahrain

Mike Potts / Arabian oryx {Oryx leucoryx} Hawar Is, Bahrain

Patricio Robles Gil / Two Gemsbok (Oryx gazella gazella) drinking at waterhole, Etosha NP, Namibia

Patricio Robles Gil / Gemsbok (Oryx gazella gazella) with young in shade of tree, Namibia

Patricio Robles Gil / Gemsbok (Oryx gazella gazella) Kgalagadi Transfrontier NP, Kalahari desert, Botswana

Hanne & Jens Eriksen / Arabian oryx (Oryx leucoryx) feeding in desert, Jaaluni, Oman

Richard Du Toit / Gemsbok / Southern oryx (Oryx gazella gazella) male flehmen response as female urinates, Kalahari Gemsbok NP, South Africa

Hermann Brehm / Oryx {Oryx gazella} walking down sand dune, Namib Desert, Namibia.