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Range DescriptionCentrocercus urophasianus inhabits the shrubland ecosystems of south-eastern Canada (Alberta and Saskatchewan) and western USA (Washington, Montana, North Dakota, South Dakota, Wyoming, Idaho, Oregon, California, Nevada, Utah and Colorado) (del Hoyo et al. 1994, Schroeder et al. 1999). Although the accurate estimation of trends is difficult, the range-wide breeding population was estimated as 142,000 individuals in 1998, clearly lower than historic levels (Braun 1998), and decline rates have been estimated at 50% or higher since 1966 (J. Wells and K. Rosenberg in litt. 2003).