Carol Walker / Mustang herd standing in snow. Black Hills Wild Horse Sanctuary, South Dakota, USA. January 2017.

Morley Read / Aerial shot of a group of wild ponies (Equus caballus) in paramo landscape at the base of Cotopaxi Volcano, Ecuadorian Andes, 2018.

Klein & Hubert / Mustang stallion kicking out after winning fight. Rocky Mountains, USA, June.

Klein & Hubert / Mustang horses, chestnut painted overo mare and her buckskin daughter, age two years, Nevada, USA.

Klein & Hubert / Dun foal jumping over a palomino yearling while playing. Nevada, USA.

Nick Upton / Feral horse (Equus caballus) walking on a remote sandy beach, near Arta, Mallorca, Spain, August.

Francisco Marquez / Round up of wild mares and foals from marshland to the corrals of the town. Donana National Park, Spain. September 2014.

Cyril Ruoso / Feral Horses (Equus caballus) gathering around waterhole, Namib-Naukluft National Park, Namibia.

Carol Walker / Two wild pinto Mustang stallions battle for dominance in Sand Wash Basin, Colorado, USA.

Carol Walker / Wild pinto Mustang mare and foal running in Sand Wash Basin, Colorado, USA.

Carol Walker / Head portrait of grey Arabian stallion running in desert dunes near Dubai, United Arab Emirates.

Carol Walker / Two wild Mustang stallions fighting in the White Mountain Herd Area, Wyoming, USA. August.

Carol Walker / Two white Camargue horses in ocean of Camargue, France, Europe. May.

Carol Walker / Wild Mustang horse rearing, Pryor mountains, Montana, USA. June.

Floris van Breugel / Wild horse / mustang in open landscape, White Mountains, California, USA, July

Kristel Richard / Two cowboys mounted on a Pantaneiro stallion, round up a band of wild Pantaneiro horses, Pantanal, Mato Grosso do Sul, Brazil. August 2015.

Klein & Hubert / Two semi-wild Criollo foals, a gray sabino colt and a sorrel / chestnut filly, Tierra del Fuego.

Pascal Pittorino / Przewalski's horse (Equus ferus przewalski) head portrait, captive, Lozere, France, December.

Roland Seitre / Przewalski horses (Equus ferus przewalskii) mother and foal, reintroduced in Takhin Tal by the International Takhi Group, Gobi Desert, Mongolia.

Roland Seitre / Przewalski's horse (Equus ferus przewalskii) grazing in buttercups, Parc de la Haute Touche, Obterre, France. May. Captive, occurs in Central Asia.

Kristel Richard / Two wild Przewalski / Takhi Horse (Equus ferus przewalskii) stallions play fighting Hustai National Park, Tuv Province, Mongolia. Endangered species. September.

Kristel Richard / Przewalski / Takhi Horse (Equus ferus przewalskii) breeding stallion stands alert, Hustai National Park, Tuv Province, Mongolia. Endangered species. September.

Kristel Richard / Band of wild Mongolian horses running on plains at the foot of Dungurukh Uul mountain, near the border with China and Kazakhstan, Bayan-Olgiy aymag, Mongolia. September.

Pal Hermansen / Wood ants (Formica rufa) with larvae on rusty car, Bastnas car graveyard, Varmland, Sweden, June.

Jeff Vanuga / Grey Camargue horses, galloping through water in the Camargue, France, April.

Angelo Gandolfi / Pantanal cowboy / gaucho (Pantaneiros) driving cattle. Pantanal, Brazil, August 2010.

Kristel Richard / Wild Chincoteague (Equus caballus) two breeding stallions greeting one another, Chincoteague National Wildlife Refuge, Chincoteague Island, Virginia, USA, June

Kristel Richard / A herd of Retuerta mares trotting, Guadiamar scientific reserve, Donana National Park, Andalusia, Spain. This breed of horse was close to extinction in the 1990s with only 5 individuals left, but now...

Peter Cairns / 2020VISION / Exmoor Ponies (Equus caballus) grazing at Seven Sisters Country Park, South Downs, England, November. Did you know? Some people believe that Exmoor ponies are related to the now extinct Tarpan horse o...

Carol Walker / Cowboy galloping through snow, wearing thick sheepskin coat, Wyoming, USA, February 2012, model released

Carol Walker / Wild horse / Mustang, foal, portrait, Pryor mountains, Montana, USA

Carol Walker / Wild horses / Mustangs, two stallions play fighting, Pryor Mountains, Montana, USA, July 2010

Carol Walker / Wild Horse / Mustang shaking head and mane, Adobe Town Herd Area, southwestern Wyoming, USA, WINNER OF WILD HORSE SECTION, EQUINE IDEAL PHOTOGRAPHY CONTEST 2012

Carol Walker / Trainer Rich Scott with Cremosso, a young male cremello Wild horse / mustang that had been rounded up from a McCullough Peak herd and put up for adoption, trainer teaching it to be led in paddock, Jul...

Carol Walker / Claro and Cremesso, two third year male cremello Wild horse / mustang colts that had been rounded up from the McCullough Peak herd, Wyoming, and put up for adoption, on their new ranch in Colorado, US...

Carol Walker / Mustang / wild horses, second year cremello colt Claro play fighting with bay, McCullough Peak herd, Wyoming, USA, July 2009

Carol Walker / Mustang / wild horses, two yearling cremello colts Claro and Cremesso playing with a bay, McCullough Peak herd, Wyoming, USA, June 2008

Carol Walker / Mustang / wild horse, cremello colt foal Cremesso interacting with yearling filly, McCullough Peak herd, Wyoming, USA, August 2007

Carol Walker / Mustang / wild horse, yearling cremello colt Claro in thick winter coat, stretching, McCullough Peak herd, Wyoming, USA, February 2008

Carol Walker / Mustang / wild horses, second year cremello colt Cremesso, reacting to black colt, McCullough Peak herd, Wyoming, USA, June 2009

Carol Walker / Mustang / wild horses, cremello colt foal Cremesso with grazing mare, McCullough Peak herd, Wyoming, USA, June 2007

Kristel Richard / An Indian cowboy has lost his balance from a bronc or wild paint horse during the All Indian Rodeo, at the annual Indian Crow Fair, at Crow Agency, near Billings, Montana, USA, August 2011, Sequence 3...

Ross Hoddinott / 2020VISION / Group of Exmoor ponies {Equus caballus}, released at Street Heath (Somerset Wildlife Trust) Nature Reserve, for conservation grazing, Somerset Levels, Somerset, UK. June 2011. Did you know? These poni...

David Tipling / 2020VISION / Exmoor Pony (Equus caballus) grazing, the ponies are used to manage grassland on the Sandlings heath, Suffolk, UK, February 2011. Photographer quote: 'These Exmoor ponies are used to replicate the gra...

Kristel Richard / Wild / feral Dulmen ponies (Equus caballus) herd of mares and foals running on the Duke of Croy's estate, Meerfelder Bruch, North Rhine-Westphalia, Germany, May 2011

Kristel Richard / Wild / feral Dulmen ponies (Equus caballus) close up of herd of mares and foals running on the Duke of Croy's estate, Meerfelder Bruch, North Rhine-Westphalia, Germany, May 2011

Kristel Richard / Wild / feral Dulmen ponies (Equus caballus) close up of herd of mares and foals running on the Duke of Croy's estate, Meerfelder Bruch, North Rhine-Westphalia, Germany, May 2011

Kristel Richard / Wild / feral Dulmen ponies (Equus caballus) herd of mares and foals running on the Duke of Croy's estate, Meerfelder Bruch, North Rhine-Westphalia, Germany, May 2011