Are you kidding me? Wild Horses and Cattle don't graze the same areas, if that were true the Cattlemen  and women's association would not fight so hard to have them removed. I am from AZ and have several photo`s of them grazing face to face, here and in Colorado. Not sure about Idaho???? but in the rest of the country Cattle and sheep are allowed to Graze on HMA`s. Including Co, Wyo, Montana, NV, Ut etc.