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
Living Desert Zoo and Gardens State Park than forty native animal species, including pronghorn, badger, bison, bobcats, mule deer, elk, kit fox, Gila monster, cougar, prairie dogs, reptiles, fourteen species of snakes, and Mexican wolves. An aviary contains golden eagles, hawks, owls, a roadrunner, songbirds, and turkeys. The gardens feature a greenhouse and hundreds of cacti and succulents from around the world, including acacia, agave, small barrel cactus, cholla, ocotillo, prickly pear, saguaro, sotol ("Dasylirion wheeleri"), and yucca. Living Desert Zoo and Gardens State Park The Living Desert Zoo and Gardens State Park, formerly the Living Desert Zoological and Botanical State Park, is a zoo and botanical