It seems like oil and water, fire and ice—opposites never meant to bond-or an oxymoron, like "jumbo shrimp," but Indian cowboys, or cowboy Indians, are not a figment of our wild imagination. Throughout the Americas, from the pampas of Argentina to the grasslands of Alberta, Indians can be found on horseback, as "cowboy" as any lanky Anglo-American in south Texas pushing through the rough chaparral.