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
Painted Desert (Arizona) he located some 40 miles east of Petrified Forest National Park. Finding the cities were not made of gold, Coronado sent an expedition to find the Colorado River to resupply him. Passing through the wonderland of colors, they named the area "El Desierto Pintado" ("The Painted Desert"). Much of the Painted Desert within Petrified Forest National Park is protected as Petrified Forest National Wilderness Area, where motorized travel is limited. Nonetheless, the park offers both easy and longer hikes into the colored hills. The Painted Desert continues north into the Navajo Nation, where off-road travel is allowed by permit. The