Jeff Vanuga / White horses of the Camargue galloping through marshes in the Camargue regioin of France.

Carol Walker / Andalusian horsea, two stallions coming together in arena one dappled grey and one pure white. Spain.

Carol Walker / RF - Percheron horse trotting through snow. Alberta, Canada. Febraury. (This image may be licensed either as rights managed or royalty free.)

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

Carol Walker / RF - Knabstrupper stallion with leopard spotting colouration, running in pasture. Germany. May. (This image may be licensed either as rights managed or royalty free.)

Klein & Hubert / Kazakh eagle hunter (Berkutchi) on horseback with his Golden eagle (Aquila chrysaetos) Altai, Mongolia. Model released.

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

Alex Mustard / Two female Common seahorses (Hippocampus kuda) fighting over territory on the seabed. The brief fight was preceeded by a ritualised, synchronised parade. Bitung, North Sulawesi, Indonesia. Lembeh Stra...

Alex Mustard / Common seahorse (Hippocampus kuda) female wrapping her prehensile tail around piece of wood on the seabed. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Ben Gillett / Slow motion clip of a female Appaloosa horse grooming a male, Bristol, England, UK, May.

Nick Hawkins / Atlantic bluefin tuna (Thunnus thynnus) off Antigonish, Nova Scotia, Canada. October .

SCOTLAND: The Big Picture / Curled octopus (Eledone cirrhosa) amongst a horse mussel bed (Modiolus modiolus) Shetland, Scotland, UK, August.

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.

Jack Dykinga / Gaucho herding horses on the shoreline of Lago Almarga in the morning light, with Torres del Paine mountains in background under stormy skies. Patagonia, Chile.

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

Klein & Hubert / Fjord or Norwegian fjord horses trotting in grass meadow in fall, France

Klein & Hubert / Fjord or Norwegian fjord horse galloping in grass meadow in fall, France

Phil Savoie / Point-to-Point horse racing, low angle view of racehorses jumping fence, Monmouthshire, Wales, UK. March 2014.

Phil Savoie / Point-to-Point horse racing, low angle view of racehorses jumping fence, Monmouthshire, Wales, UK. March 2014.

Phil Savoie / Point-to-Point horse racing, low angle view of racehorse jumping fence, Monmouthshire, Wales, UK. March 2014.

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

Jordi Chias / European barracuda (Sphyraena sphyraena) and Bluefish (Pomatomus saltatrix) circling baitball of Atlantic horse mackerel (Trachurus trachurus) Formigas Islets, Azores. Finalist in the Underwater Categ...

Brian Bevan / Close-up of a group of Wood ants (Formica rufa) carrying a dead insect back to their nest, Bedfordshire, England, UK, August.

Brian Bevan / Close-up of a group of Wood ants (Formica rufa) carrying a dead Common wasp (Vespula vulgaris) back to their nest, Bedfordshire, England, UK, August.

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.

Klein & Hubert / Friesian horse (Equus caballus), mare standing in snow, France.

Stephen Dalton / Horse fly (Tabanus sp) male taking off from poppy seed-head (Papaver rhoeas) Sussex, UK

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

Niall Benvie / Icelandic horse foal near Stokkness, Iceland, September.

Niall Benvie / Young Icelandic horse near Stokkness, Iceland, March.

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.

Juan Carlos Munoz / Close up of horse wearing bridle, Sierra de Gredos, Avila, Castile and Leon, Spain.

Juan Carlos Munoz / Close up of horse wearing bridle, Sierra de Gredos, Avila, Castile and Leon, Spain.

Jeff Vanuga / White horses of the Camargue galloping through marshes in the Camargue, France. April.

Jeff Vanuga / White horse of the Camargue galloping through marshes in the Camargue, France. April.

Jeff Vanuga / White horses of the Camargue galloping through marshes in the Camargue, France. April.

Aflo / Horse walking through heavy snowfall, Shimokita Peninsula, Hokkaido, Japan.

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

Kristel Richard / Headshot of two rare black Kladruber stallions, harnessed for driving, at the Great Riding festival, in Slatinany national stud, Pardubice Region, Czech Republic. June 2015.

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