Yva Momatiuk & John Eastcott / Mustang (Equus caballus) mother and foal, Oshoto, Wyoming

Yva Momatiuk & John Eastcott / Mustang (Equus caballus) mother and foal, Oshoto, Wyoming

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

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

Yva Momatiuk & John Eastcott / Wild Horse (Equus caballus) stallions play fighting, Pryor Mountain Wild Horse Range, Montana

Donald M. Jones / Wild Horse (Equus caballus) fighting stallions, Wyoming

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