Carol Walker / Aerial view of a wild palomino pinto stallion chasing his black mare on the windblown snow on Crooks Mountain, Wyoming, USA. March.

Carol Walker / A wild pinto stallion with his foal in grassland, McCullough Peaks, Wyoming, USA. October.

Carol Walker / Two wild stallions, one a brown curly and the other a sorrel, mutual grooming on snow-covered grassland, Salt Wells Creek, Wyoming, USA. January.

Carol Walker / A wild sorrel stallion looking back on snow-covered landscape, Green Mountain, Wyoming, USA. January.

Carol Walker / A wild red roan stallion rearing up as a rival approaches, Salt Wells Creek, Wyoming, USA. June.

Carol Walker / A wild black mare, head portrait, McCullough Peaks, Wyoming, USA. July.

Carol Walker / Five wild stallions interacting, portrait, McCullough Peaks, Wyoming, USA. July.

Carol Walker / Two wild stallions standing nose to nose, the older pinto on the left is the band stallion, McCullough peaks, Wyoming, USA. July.

Carol Walker / Two wild horses, sibling fillies, nuzzling, Lost Creek, Wyoming, USA. June.

Carol Walker / Pinto stallion, portrait, McCullough Peaks, Wyoming, USA. October.

Carol Walker / A wild grey pinto stallion trotting over grassland, Green Mountain, Wyoming, USA. May.

Carol Walker / A wild pinto mare with her blanket appaloosa yearling and buckskin filly, walking over grassland, Lost Creek, Wyoming, USA. August.