Juan Carlos Munoz / Grevy's zebra (Equus grevyi) close up of muzzle, Captive, occurs in Kenya and Ethiopia, Endangered species.

Mark MacEwen / Grevy's zebra (Equus grevyi) close-up of coat, Ol Pejeta Conservancy, Kenya, Africa.

Edwin Giesbers / Grevy's zebra (Equus grevyi) close up, captive

Edwin Giesbers / Grevy zebra (Equus grevyi) partial head portrait over back of foal, captive

Andy Rouse / Grevy's Zebra (Equus grevyi) in late sunlight. Samburu, Kenya, Africa. (non-ex).

Suzi Eszterhas / Grevy's Zebra (Equus grevyi), Lewa Wildlife Conservation Area, northern Kenya

Anup Shah / Rear view of Grevy's zebra {Equus grevyi} Masai Mara NR, Kenya

Anup Shah / Head portrait of Grevy's zebra (Equus grevyi) Kenya, East Africa

Peter Blackwell / Head of Grevy's zebra (Equus grevyi). Samburu NR, Kenya, East Africa

Andrew Peacock / Grevy's Zebra (Equus grevyi) and Burchell's Zebra (Equus burchellii) hybrid, Ol Pejeta Conservancy, Kenya

Andrew Peacock / Grevy's Zebra (Equus grevyi) and Burchell's Zebra (Equus burchellii) herd, El Barta, Kenya

Eric Baccega / Grevy zebra (Equus grevyi) stallions fighting, Samburu National Reserve, Kenya.

Eric Baccega / Grevy zebra (Equus grevyi) stallions fighting, Samburu National Reserve, Kenya.

Eric Baccega / Grevy zebra (Equus grevyi) stallions fighting, Samburu National Reserve, Kenya.

Eric Baccega / Grevy zebra stallions (Equus grevyi) Samburu National Reserve, Kenya.

Eric Baccega / Grevy zebra (Equus grevyi) stallions fighting Samburu National Reserve, Kenya.

Eric Baccega / Grevy zebra (Equus grevyi) stallions fighting, Samburu National Reserve, Kenya.

Eric Baccega / Grevy's zebra (Equus grevyi) portrait, captive, Zoo Parc Beauval, France.

Jen Guyton / Grevy's zebra (Equus grevyi) on the Laikipia Plateau, Kenya.

ZSSD / Grevy's Zebra (Equus grevyi) foal with mother, San Diego Zoo Safari Park, California

ZSSD / Grevy's Zebra (Equus grevyi) foal with mother, San Diego Zoo Safari Park, California

Juan Carlos Munoz / Grevy's zebra (Equus grevyi) close up ears, captive.

Juan Carlos Munoz / Grevy's zebra (Equus grevyi) close up of hind quarters of male with penis extended from sheath, captive.

Juan Carlos Munoz / Grevy's zebra (Equus grevyi) close up of mane. Captive.

Juan Carlos Munoz / Grevy's zebra (Equus grevyi) close up of tail, Captive, occurs in Kenya and Ethiopia, Endangered species.

Juan Carlos Munoz / Grevy's zebra female (Equus grevyi) close up of tail swinging, Captive, occurs in Kenya and Ethiopia, Endangered species.

Juan Carlos Munoz / Grevy's zebra (Equus grevyi) close up of tail, Captive, occurs in Kenya and Ethiopia, Endangered species.

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

Philippe Clement / Grevy's zebra (Equus grevyi) close up of head. Cabarceno Park, Cantabria, Spain. Captive, occurs in Kenya and Ethiopia.

Loic Poidevin / Grevy's zebra (equus grevyi) mother grazing with foal, Samburu, Kenya, October, Endangered species.

Loic Poidevin / Grevy's zebra (Equus grevyi) walking, Samburu, Kenya, October, Endangered species.

Loic Poidevin / Grevy's zebra (Equus grevyi) portrait, Samburu, Kenya, October, Endangered species.

Loic Poidevin / Grevy's zebra (Equus grevyi) grazing, Samburu, Kenya, October, Endangered species.

ZSSD / Grevy's Zebra (Equus grevyi) with foal

Eric Baccega / Grevy's zebra walking (Equus grevyi), Samburu National Reserve, Kenya, Africa. Endangered species.

Denis-Huot / Grevy's zebra (Equus grevyi) Samburu game reserve, Kenya

Denis-Huot / Grevy's zebra (Equus grevyi) Samburu game reserve, Kenya

Ann & Steve Toon / Grevy zebra (Equus grevyi) two grazing on savanna, one very pregnant, Lewa conservancy, Laikipia, Kenya

Winfried Wisniewski / Grevy's Zebra (Equus grevyi), Samburu-Isiolo Game Reserve, Kenya

Edwin Giesbers / Grevy zebra (Equus grevyi) close up of stripes, captive

Edwin Giesbers / Grevy zebra (Equus grevyi) close up of stripes, captive

Edwin Giesbers / Grevy's zebra (Equus grevyi) close up of mane hair and stripes, captive

Edwin Giesbers / Grevy's zebra (Equus grevyi) close up of back stripes, captive

Edwin Giesbers / Grevy's zebra (Equus grevyi) close up of stripes, captive

Edwin Giesbers / Grevy's zebra (Equus grevyi) abstract rear view of back and behind, captive

Edwin Giesbers / Grevy zebra (Equus grevyi) abstract view of rear end, captive

Edwin Giesbers / Grevy's zebra (Equus grevyi) abstract view of paler foal stripes against adult darker stripes, captive

Edwin Giesbers / Plains/common zebra (Equus quagga) close up, captive

Edwin Giesbers / Grevy's zebra (Equus grevyi) abstract view of head and stripes, captive

Edwin Giesbers / Plains/common zebra (Equus quagga) close up of back hair, captive

ZSSD / Grevy's Zebra (Equus grevyi), native to Africa

Andy Rouse / Portrait of Grevy's Zebra (Equus grevyi). Savuti, Kenya.

Lisa Hoffner / Dead Grevy's Zebra (Equus grevyi) most likely the result of the worst drought (2008-2009) in more than a decade in Northern Kenya. August 2009.

ZSSD / Grevy's Zebra (Equus grevyi), native to Africa

Tui De Roy / Domestic Horse (Equus caballus) and Grevy's Zebra (Equus grevyi) hybrid, Mount Kenya Wildlife Conservancy, Kenya

Tui De Roy / Grevy's Zebra (Equus grevyi) herd, Mpala Research Centre, Kenya

Tui De Roy / Grevy's Zebra (Equus grevyi) mother and foal, Lewa Wildlife Conservation Area, Kenya

Tui De Roy / Grevy's Zebra (Equus grevyi) mother and foal drinking at waterhole, El Karama Ranch, Kenya

Tui De Roy / Grevy's Zebra (Equus grevyi) group running from waterhole, Loisaba Wilderness, Kenya

Tui De Roy / Grevy's Zebra (Equus grevyi) trio, Tumaren Ranch, Kenya

Tui De Roy / Grevy's Zebra (Equus grevyi) pair, Mpala Research Centre, Kenya

Tui De Roy / Grevy's Zebra (Equus grevyi) pair, Tumaren Ranch, Kenya

Tui De Roy / Grevy's Zebra (Equus grevyi), Kenya

Tui De Roy / Grevy's Zebra (Equus grevyi) group drinking at waterhole, Lewa Wildlife Conservation Area, Kenya

Tui De Roy / Grevy's Zebra (Equus grevyi) mother and foal, Kenya

Tui De Roy / Grevy's Zebra (Equus grevyi) trio drinking, Lewa Wildlife Conservation Area, Kenya

Tui De Roy / Grevy's Zebra (Equus grevyi) group drinking, Lewa Wildlife Conservation Area, Kenya

Tui De Roy / Grevy's Zebra (Equus grevyi) group drinking, Lewa Wildlife Conservation Area, Kenya

Tui De Roy / Grevy's Zebra (Equus grevyi) stallions fighting, Lewa Wildlife Conservation Area, Kenya

Tui De Roy / Grevy's Zebra (Equus grevyi), Lewa Wildlife Conservation Area, Kenya

Tui De Roy / Grevy's Zebra (Equus grevyi) herd, Mpala Research Centre, Kenya

Tui De Roy / Grevy's Zebra (Equus grevyi) group, Mpala Research Centre, Kenya

Tui De Roy / African Elephant (Loxodonta africana) and Grevy's Zebra (Equus grevyi), Tumaren Ranch, Kenya

Suzi Eszterhas / Belinda Low (Executive Director) and Peter Lalampaa (Field Program Coordinator) of Grevy's Zebra Trust at Kalama Conservancy Headquarters Kalama Conservancy, Northern Rangelands Trust, Kenya, January...

Suzi Eszterhas / Grevy's Zebra (Equus grevyi) pair in landscape, Lewa Wildlife Conservancy, Northern Kenya

Suzi Eszterhas / Grevy's Zebra (Equus grevyi) group in landscape, Lewa Wildlife Conservancy, Northern Kenya

Suzi Eszterhas / Children in a Laresoro village in the Samburu are taught about Grevy's Zebra by Jalango Lekureiya (Grevy's Zebra Scout) Near Kalama Conservancy, Northern Kenya, East Africa, January 2007

Suzi Eszterhas / Grevy's Zebra (Equus grevyi) one zebra rubbing its head on another's rear, Lewa Wildlife Conservancy, Northern Kenya, Endangered species

Suzi Eszterhas / Grevy's Zebra (Equus grevyi) mother and young foal, Lewa Wildlife Conservancy, Northern Kenya, Endangered species

Suzi Eszterhas / Grevy's Zebra (Equus grevyi) mother and young foal, Lewa Wildlife Conservancy, Northern Kenya, Endangered species

Suzi Eszterhas / Grevy's Zebra (Equus grevyi) mother and young foal, Lewa Wildlife Conservancy, Northern Kenya, Endangered species

Tui De Roy / Grevy's Zebra (Equus grevyi) mothers and foals, Mpala Research Centre, Kenya

Tui De Roy / Grevy's Zebra (Equus grevyi) pair, Mpala Research Centre, Kenya

Tui De Roy / Grevy's Zebra (Equus grevyi) grazing, Lewa Wildlife Conservancy, Kenya

Kristel Richard / Grevy zebra {Equus grevyi} in landscape, Lewa Downs Reserve, Kenya

Kristel Richard / Grevy zebra {Equus grevyi} in landscape, Lewa Downs Reserve, Kenya

Andy Rouse / Grevy's zebra (Equus grevyi) portrait, Kenya

Suzi Eszterhas / Grevy's Zebra (Equus grevyi) study area sign for the Grevy's Zebra Trust, northern Kenya

Suzi Eszterhas / Grevy's Zebra (Equus grevyi) collared by researchers of the Grevy's Zebra Trust, Lewa Wildlife Conservation Area, northern Kenya

Suzi Eszterhas / Grevy's Zebra (Equus grevyi) biologist, Belinda Low of the Grevy's Zebra Trust uses radio telemetry to track the movements of zebras, Lewa Wildlife Conservation Area, northern Kenya

Suzi Eszterhas / Grevy's Zebra (Equus grevyi) hide used to make water jug, Lewa Wildlife Conservation Area, northern Kenya

Suzi Eszterhas / Grevy's Zebra (Equus grevyi) herd grazing, Lewa Wildlife Conservation Area, northern Kenya

Suzi Eszterhas / Grevy's Zebra (Equus grevyi) profile, Lewa Wildlife Conservation Area, northern Kenya

Suzi Eszterhas / Grevy's Zebra (Equus grevyi) mother and young foal, Lewa Wildlife Conservation Area, northern Kenya