On Kofa NWR in southwest Arizona, the Castle Dome and Kofa Mountains rise up abruptly from the plains of the Sonoran Desert. The two mountain ranges dominate the 665,400-acre refuge, of which more than 80 percent is designated as wilderness. The rugged mountains provide excellent desert bighorn sheep habitat, whereas the desert plains are ideal for the endangered Sonoran pronghorn whose numbers th
e refuge is working to recover. The teddybear cholla and the towering saguaro cactus are common on Kofa NWR. These and other species of cacti are able to store large quantities of water to survive the harsh desert environment. Palm Canyon, located in the western region of the refuge, is well known for its native California fan palms. Numbering less than 100, the handful of trees is among the only native palms in Arizona. The vast desert environment is home to numerous animal species. Large-eared mule deer can be seen finding respite from the heat under trees and overhanging banks. The venomous Gila monster, the largest land lizard native to the U.S., might be spotted while driving or hiking on a cool morning. Other species found on Kofa NWR include desert tortoises, mountain lions, foxes, rattlesnakes, turkey vultures, and Gambel’s quails.
