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

Wild Wonders of Europe / Lesniewski / Herd of wild Carpathian Ponies / Hurcul (Equus caballus) running in snow. Bieszczady, Carpathian Mountains, Poland, March.

Wild Wonders of Europe / Lesniewski / Herd of wild Carpathian Ponies / Hurcul (Equus caballus) in snow. Bieszczady, Carpathian Mountains, Poland, March.

Terry Whittaker / 2020VISION / Konik horse (Equus caballus) pair interacting, wild herd in rewilding project, Wicken Fen, Cambridgeshire, UK, June 2011

Jeff Vanuga / McCullough Peaks wild horses (Equus caballus) rearing up against each other. Cody, Wyoming, July.

Charlie Summers / Two Wild Horse Stallions (Equus caballus) fighting in mist. Montana, USA, June.

Kristel Richard / Feral domestic horses (Equus caballus) wild herd stallion (grey) fighting a bachelor chestnut stallion, Blue Swallow Reserve, near Kaapsehoop, Mpumalanga province / Eastern Transvaal, South Africa, O...

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

Mike Potts / Wild goats (Capra hircus) resting on coastal promontory, one yawning, Great Orme, Llandudno, Gwynedd, North Wales, UK, August

Brian Lightfoot / Feral goats (Capra hircus) Scotland.

John Cancalosi / Feral goat (Capra hircus) Scotland