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
Tirari Desert Tirari Desert The Tirari Desert is a desert in the eastern part of the Far North region of South Australia. It stretches 212 km from north to south and 153 km from east to west . The Tirari Desert features salt lakes and large north-south running sand dunes. It is located partly within the Kati Thanda-Lake Eyre National Park. It lies mainly to the east of Lake Eyre North. Cooper Creek runs through the centre of the desert. The adjacent deserts of the area include Simpson Desert which lies to the north while the Strzelecki Desert is to the east