Philippe Clement / Poitou donkey (Equus africanus asinus) with shaggy coat on the island Ile de Re, Charente-Maritime, France

Carol Walker / Girl stroking donkey (Equus asinus) New Mexico, USA, September 2011, model released

Ernie Janes / Domestic donkey (Equus asinus) looking over fence, Norfolk, UK

John Cancalosi / Feral Burro / Donkey foal (Equus asinus) head portrait lying in long grass, Custer State Park, South Dakota, USA

John Cancalosi / Feral Burro / Donkey (Equus asinus) female and foal, portrait standing in long grass, Custer State Park, South Dakota, USA

Jabruson / Gula man riding donkey (Equus africanus asinus) carrying water from well, Zakouma National Park, Chad, March 2010

Juan Manuel Borrero / Donkey female with foal, Catalonian race, Lleida Province, Spain

Tony Phelps / Donkey Cart on road, Seweweekspoort, Little Karoo, Western Cape, South Africa, November 2012

Philippe Clement / Poitou donkeys (Equus asinus) with shaggy coats in field on the island Ile de Re, Charente-Maritime, France, September 2012

Tom Vezo / Donkey (Equus asinus), Gammons Gulch, Arizona

Carol Walker / Burro (Equus asinus), Dreamcatcher Horse and Burro Sanctuary, California, USA

Carol Walker / Burro (Equus asinus), Dreamcatcher Horse and Burro Sanctuary, California, USA

Carol Walker / Burro (Equus asinus), Dreamcatcher Sanctuary, California, USA

Pete Oxford / Feral Donkey or Ass (Equus africanus asinus) in cactus scrub ecosystem, Bonaire, Netherlands Antilles, Caribbean. Brought to the islands as pack animals in the 1800's they are now feral, 2011

Pete Oxford / Feral donkey or ass (Equus africanus asinus) in cactus scrub ecosystem, Bonaire, Netherlands Antilles, Caribbean. Brought to the islands as pack animals in the 1800's they are now feral.

Roger Powell / Woolly Paramo Donkey (Equus africanus asinus) sub-species left to run wild on Great Blasket Island, Co. Kerry, Republic of Ireland, June

LYNN M. STONE / Portrait of Donkey, East Granby, Connecticut, USA

LYNN M. STONE / Donkey standing in snow covered field, Belvidere, Illinois, USA

Konrad Wothe / Donkey (Equus asinus) mother grazing with foal in orchard, Bavaria, Germany

Konrad Wothe / Donkey (Equus asinus) foal, Bavaria, Germany

Konrad Wothe / Donkey (Equus asinus) mother with foal in meadow, Bavaria, Germany

Konrad Wothe / Donkey (Equus asinus) mother with foal in orchard, Bavaria, Germany

Ernie Janes / People standing by a donkey cart with the Atlas Mountains in the distance. Skoura Oasis, Morocco, North Africa, March 2011.

Ernie Janes / Donkey (Equus asinus) and cart with Atlas Mountains on the horizon. Skoura Oasis, Morocco, North Africa, March 2011.

LYNN M. STONE / Belted Galloway Cow (Bos taurus) and Donkey (Equus asinus) standing in snow-covered field. Belvidere, Illinois, USA, February.

Nick Upton / Domestic donkey (Equus asinus) wearing a saddle, tethered on a Lesbos / Lesvos hillside near the coast. Molyvos, Greece, August 2010

Nick Upton / Domestic donkey (Equus asinus) wearing a saddle, tehered on a Lesbos / Lesvos hillside near the coast at Molyvos, Greece, August 2010.

John Cancalosi / Feral Burro / Donkey (Equus asinus) portrait, Custer State Park, South Dakota, USA

John Cancalosi / Burro / Feral Donkey (Equus asinus) braying, Custer State Park, South Dakota, USA

Ernie Janes / Domestic donkey (Equus asinus) yawning, Norfolk, UK

Charlie Summers / Wild donkeys / Burros (Equus africanus asinus) fighting, Custer State Park, South Dakota, USA, September

Philippe Clement / Grand Noir du Berry donkey (Equus asinus) in field, La Brenne, France

Ernie Janes / Working donkey (Equus asinus) beside street bus stop, Lesbos, Greece, September 2005

Ernie Janes / Two Domestic donkeys (Equus asinus) looking over fence, Norfolk, UK

Ernie Janes / Domestic donkey (Equus asinus) yawning, Norfolk, UK

Ernie Janes / Two Domestic donkeys (Equus asinus) looking over fence, Norfolk, UK

John Cancalosi / Feral Burro / Donkey foal (Equus asinus) standing in long grass, Custer State Park, South Dakota, USA

John Cancalosi / Feral Burro / Donkey foal (Equus asinus) standing in long grass, Custer State Park, South Dakota, USA

John Cancalosi / Feral Burro / Donkey (Equus asinus) female and foal, portrait standing in long grass, Custer State Park, South Dakota, USA

John Cancalosi / Feral Burro / Donkey foal (Equus asinus) portrait standing in long grass, Custer State Park, South Dakota, USA

John Cancalosi / Feral Burro / Donkey (Equus asinus) head portrait, Custer State Park, South Dakota, USA

Floris van Breugel / Wild Burros (Equus asinus) group portrait standing in a remote canyon in Panamint Valley, Death Valley National Park, California, USA. December 2009.

Floris van Breugel / Wild Burro (Equus asinus) portrait standing in a remote canyon in Panamint Valley, Death Valley National Park, California, USA. December 2009.

Michele Westmorland / Wild donkeys of Salt Cay at old gas station, Grand Turk Island, Turks and Caicos, Caribbean. June 2007.

Kristel Richard / A masked rider mounted on a donkey (Equus asinus) mocks the 'Sartiglia' (a horse race to the star) in Oristano, Sardinia, Italy. February 2010

LYNN M. STONE / Head portrait of miniature Donkey (Equus asinus) foal standing in clover and grass, Middletown, Connecticut, USA

Eric Baccega / Woman brushing / grooming her domestic donkey, Cotentin breed (Equus asinus) France

Eric Baccega / Female Cotentin domestic donkey (Equus asinus) in field, France

Eric Baccega / Woman brushing her female Cotentin breed of donkey (Equus asinus) France

Wild Wonders of Europe / Lilja / Donkey on cliff top, Karpaz Peninsula, Northern Cyprus, April 2009

Angelo Gandolfi / Donkey (Equus asinus) in Bulnes village, Picos de Europa National Park, Cantabria, Spain. July 2008.

Wild Wonders of Europe / Geidemark / Donkey's head sticking out from pile of hay it is carrying, Lake Prespa National Park, Albania, June 2009

Wild Wonders of Europe / Geidemark / Farmer walking next to donkey pulling cart loaded with hay, Lake Prespa National Park, Albania, June 2009

Wild Wonders of Europe / Geidemark / Farmer with donkey, Lake Prespa National Park, Albania, June 2009

Wild Wonders of Europe / Geidemark / Donkey carrying a large hay load, Lake Prespa National Park, Albania June 2009

Juan Manuel Borrero / Donkey pulling cart with crates of bottles, Meknes, Morocco, March 2009

Juan Manuel Borrero / Donkey carrying bricks building material, Meknes, Morocco, March 2009

Tim Martin / Domestic donkey (Equus asinus) browsing on gorse bush. New Forest National Park, Hampshire, UK. May 2008.

Merryn Thomas / Tourists crossing shallow river on horseback, Aït Benhaddou Kasbah UNESCO site, Morocco. November 2008.

Michele Westmorland / Wild donkey {Equus asinus} digging in sand for water, Skeleton Coast, Namibia

LYNN M. STONE / Wild donkey / Burro {Equus asinus} in desert, Arizona, USA

Michael & Patricia Fogden / Kuiseb River on a rare day when it flows showing donkeys arriving to drink, Namib Desert, Namibia

Michael & Patricia Fogden / Kuiseb River on a rare day when it flows showing donkeys arriving to drink, Namib Desert, Namibia

Albert Lleal / Donkey (Equus asinus) foraging among garbage strewn streets of Ouahigouya, Burkina Faso, west Africa

Dietmar Nill / Donkey cart traffic on a country road in Bulgaria, 2006

Luciano Candisani / Donkey (Equus asinus) portrait, Rondonia, Brazil

Nature Production / Donkey {Equus asinus} Japan

Konrad Wothe / Donkey (Equus asinus) adult with foal, Bavaria, Germany

Konrad Wothe / Donkey (Equus asinus) adult with foal, Bavaria, Germany

Konrad Wothe / Donkey (Equus asinus) adult with foal, Bavaria, Germany

Konrad Wothe / Donkey (Equus asinus) foal, Bavaria, Germany

Konrad Wothe / Donkey (Equus asinus) foal, Bavaria, Germany

Konrad Wothe / Donkey (Equus asinus) adult with foal, Bavaria, Germany

Konrad Wothe / Donkey (Equus asinus) foal running through field, Bavaria, Germany

Konrad Wothe / Donkey (Equus asinus) adult with foal, Bavaria, Germany

Konrad Wothe / Donkey (Equus asinus) foal resting, Bavaria, Germany

Konrad Wothe / Donkey (Equus asinus) two foals communicating, Bavaria, Germany

Tui De Roy / Feral Donkey (Equus asinus) grazing on shrubs, San Benito Island, Baja California, Mexico

LYNN M. STONE / Domestic donkey {Equus asinus} standing in field, Vermont, USA

LYNN M. STONE / Domestic donkey {Equus asinus} jennet and foal, standing in field, Vermont, USA

George McCarthy / Domestic donkey {Equus asinus} standing in field, Island of Lesvos, Greece

LYNN M. STONE / Domestic donkey {Equus asinus} jennet and foal standing in field, Vermont, USA

George McCarthy / Domestic donkey (Equus asinus), Island of Lesvos, Greece

Pete Oxford / Domestic donkeys {Equus asinus} carrying bricks, outside Taj Mahal, Agra, India

John Downer / Domestic donkey {Equus asinus} with ancient pyramids of Giza in background, Egypt

Rod Williams / Somali wild ass {Equus asinus somalicus} mother suckling foal, Critically endangered, captive, from Somalia

Eric Baccega / Domestic donkey {Equus asinus} Contentin breed - head portrait

Jose B. Ruiz / Extremaduran Donkey {Equus asinus} The Barruecos, Malpartida de Cáceres, Extremadura, Spain.

Yva Momatiuk & John Eastcott / Mule (Equus caballus x asinus) jack, Saskatchewan, Canada

Duncan Usher / Donkey (Equus asinus) colt running through field, Europe

Duncan Usher / Donkey (Equus asinus) female with colt, Europe

Tui De Roy / Feral Donkey (Equus asinus) in small family herds compete with Galapagos Tortoise for food and trample nesting areas, Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador

Konrad Wothe / Donkey (Equus asinus) foal resting in field of flowers, Germany

Konrad Wothe / Donkey (Equus asinus) foal in field of flowers, Germany

WILLIAM OSBORN / Feral Donkey {Equus asinus} Northern Territory, Australia

LYNN M. STONE / Domestic donkey. Wisconsin, USA