http://www.wildlife.state.nm.us/education/wildlife_notes/documents/desertbighornsheep.pdf New Mexico Game & Fish (2002) "Desert bighorn sheep" Wildlife Notes] An area of 57215 acres in the southern portion of the San Andres Mountain range was set aside in 1941 as the San Andres National Wildlife Refuge San Andres National Wildlife Refuge official webpage to help preserve the desert bighorn sheep, which at the time numbered 33.