Desert bighorn sheep establish two desert areas in southwestern Arizona to help preserve the desert bighorn sheep: Cabeza Prieta National Wildlife Refuge and the Kofa National Wildlife Refuge. In 1941, the San Andres National Wildlife Refuge in New Mexico was added. Desert bighorn sheep populations have trended upward since the 1960s when their population was estimated at 6,700-8,100. The upward trend was caused by conservation measures, including habitat preservation. In 1980, desert bighorn sheep populations were estimated at 8,415-9,040. A state-by-state survey was conducted a few years later and estimated the overall US desert bighorn sheep population at 15,980. The 1993 estimate of
Great Sandy Desert Great Sandy Desert The Great Sandy Desert is an interim Australian bioregion, located in the North West of Western Australia straddling the Pilbara and southern Kimberley regions. It is the second largest desert in Australia after the Great Victoria Desert and encompasses an area of The Gibson Desert lies to the south and the Tanami Desert lies to the east of the Great Sandy Desert. The Great Sandy Desert contains large ergs, often consisting of longitudinal dunes. In the North East of the desert there is a meteorite impact crater, the Wolfe Creek crater. The region is sparsely populated. The