Carol Walker / Wild Horse / Mustang pinto stallion rearing, McCullough Peaks Herd Area, Cody, Wyoming, USA

Carol Walker / Purebred black Friesian stallion doing passage, Ojai, California, USA,

Carol Walker / Bay Peruvian Paso stallion running in field, Ojai, California, USA

Carol Walker / Purebred Gypsy Vanner stallion running, Ojai, California, USA

Carol Walker / Mustangs / Wild horses, stallion and mare trotting, Return to Freedom Sanctuary, Lompoc, California, USA

Carol Walker / Mustang / wild horse, grey stallion running, Adobe Town Herd Management Area, Southwestern Wyoming, USA

Carol Walker / Grey Andalusian stallion running on the beach at Ojai, California, USA

Carol Walker / Purebred dappled grey Andalusian stallion doing passage steps, Ojai, California, USA

Carol Walker / Grulla Mustang stallion running in dust at Return to Freedom Sanctuary, Lompoc, California, USA

Carol Walker / Purebred black Friesian stallion trotting, Ojai, California, USA

Carol Walker / Mustangs / Wild horses, stallion running, Return to Freedom Sanctuary, Lompoc, California, USA

Eric Baccega / Semi wild Przewalski horses (Equus ferus przewalskii), stallion biting another stallion to chase it from his herd, Parc du Villaret, Causse Mejean, Lozere, France