Yuma Desert
The listed birds are based on the southern section of the Lower Colorado River Valley, from Yuma County and La Paz County, to the Bill Williams River, (and by extension to Needles, California/Topock, Arizona). The Colorado River borders the higher elevation Mojave Desert to the northwest (Needles and Las Vegas), the Colorado Desert–(extension of Sonoran Desert) on the southwest and west, and the deserts of the Sonoran Desert to the east, the Yuma Desert, Lechuguilla Desert, and the Tule Desert.