Northern Mexico is dominated by two great deserts; the Sonoran and Chihuahuan. In this film, we'll unravel the forces that have created this arid world, and discover that for the animals living here, overcoming the conditions can bring rich rewards. In Central Northern Mexico are vast prairies that gave rise to the cowboy culture, and still provide a refuge for extensive colonies for charming black tailed prairie dogs and one of Mexico's rarest animals, the aplomado falcon. Beyond the prairies is the Chihuahuan desert. Bigger than Montana it hides one of Mexico's greatest natural wonders. The valley of Cuatrocienegas is full of natural springs that are home to many species of fish found nowhere else on earth.