Guanaco geographic range, study area, and roads surveyed. a Former and present guanaco distribution throughout South America (adapted from Franklin et al. 1997) and study area, Santa Cruz province in southern Argentine Patagonia. b Initial stratification in 12 regions, based on productivity (three NDVI categories: low, medium, and high) and topography (two categories: flat and rugged terrain). The surveyed roads are shown.