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
St. Jerome in the Desert (Bellini, Washington) with a walled city. In the centre background is another city on an island or peninsula in the sea. The fig tree, bare tree and crumbled rocks are all theological symbols. The upper left part of the ruins and other more stiffly-painted parts of the background were probably produced by Bellini's studio. St. Jerome in the Desert (Bellini, Washington) St. Jerome in the Desert is a 1505 oil on canvas painting by Giovanni Bellini, now in the National Gallery of Art in Washington. Little remains of the signature on the first rock in the left foreground, but it has been