young gray grullo wild horse mustang stallion in the pryor mountains wild horse range on the border of wyoming in the usa

america animal arrowhead big black blue bowl caballus canyon cut equus female feral ferus free gray grulla grullo horn horse male mammal mane mare montana mountain mountains mustang one proud pryor pryors range ridge roan rockies rocky scar silver stallion states sykes tail teacup tillett united usa west western white wild wyoming young