These are the mustangs that live on Pryor Mountain, in the Wild Horse Refuge. Cloud, Boulder, Red Raven and others were made famous by Ginger Kathren and her documentary on his life featured on 'Nature'.
Brahma was excessively sparing with earth, water, and fire.... The reckless expenditure of air and ether in his composition was amazing. And, in consequence, he perpetually struggled to outreach the wind, to outrun space itself. Other animals ran only when they had a reason, but the Horse would run for no reason whatever, as if to run out of his own skin. ~Rabindranath Tagore