wild horse mustang grullo stallion running in the pryor mountains wild horse range on the montana wyoming border in the united

america animal big black caballus canter canyon chase chasing equus feral ferus free gallop galloping gray grulla grullo horn horse horses icon male mammal mane montana mountains mustang one proud pryor pryors range roan run running silver stallion states tail tree trot united usa walking western white wild wilderness wildlife wyoming