Carol Walker / Silhouette of cowboy standing on horse throwing a lassoo at sunset, Sombrero Ranch, Colorado, USA, May 2010, model released

Kristel Richard / Two riders lassoo a bull outside the arena during the Extreme Bull competition, in Cody, Wyoming, USA, 2009

Carol Walker / Silhouette of cowboy trotting, swinging a loop at sunset, Flitner Ranch, Shell, Wyoming, USA Model released

Carol Walker / Cowboy riding in snow, ready to throw a loop, Flitner Ranch, Shell, Wyoming, USA Model released

Carol Walker / Cowboy swinging a loop on Quarter horse running in the snow at Flitner Ranch, Shell, Wyoming, USA Model released

Shattil & Rozinski / Cowboy rounding up horses at dawn, Colorado, USA. Model released

Shattil & Rozinski / Cowboys rounding up horses, Colorado, USA. Model released

Carol Walker / Cowboy galloping on horse while swinging a loop / lassoo, Flitner Ranch, Shell, Wyoming, USA, model released

Carol Walker / Cowboy riding horse whilst coiling rope lassoo, Flitner Ranch, Shell, Wyoming, USA, model released

Carol Walker / Cowboy riding horse and swinging rope lassoo, Flitner Ranch, Shell, Wyoming, USA, model released

Carol Walker / Cowboy galloping while swinging a rope lassoo at sunset, Flitner Ranch, Shell, Wyoming, USA, model released

Jeff Vanuga / Cowboy with lariat riding through winter snow, Shell, Wyoming, USA, Model released