GROUND SQUIRREL   DESERT BIOME   Great Basin Desert North American Deserts gallery   Sonoran Desert Ecological processes gallery   Mojave Desert Cactus gallery   Chihuahuan Desert Mammal gallery   Baja California desert Human impact gallery     Bird and reptile gallery       Bruchid beetles Saguaro cactus Soil crusts Harris hawk Nitrogen-fixing trees Alluvial fans Bajadas Coyote Creosote bush Nurse plants Yucca