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
Mount Desert Light Mount Desert Light Mount Desert Light is a lighthouse on Mount Desert Rock, a small island about south of Mount Desert Island, in the US state of Maine. The light station was established in 1830; the current lighthouse was built in 1847. It was listed on the National Register of Historic Places as Mount Desert Light Station in 1988. The conical granite structure was one of a series of lighthouses in Maine designed by architect Alexander Parris. A bell tower and fog bell were added in 1858, as was a new lantern with a 3rd order Fresnel lens. The bell