Chuckwallas range across the Mojave and Sonoran deserts of southeastern California, southern Nevada and Utah, western Arizona and south to Sonora, Mexico. These large, plump lizards have loose folds of skin around the neck and shoulders. They have a thick blunt tail and grow 11 to 18 inches long. These diurnal lizards emerge in the morning and, before seeking food, bask in the sun until its optimum body temperature of 100 - 105 degrees F. is reached. Strictly herbivorous, it eats fruit, leaves, buds and flowers. When the Chuckwalla senses danger, it scurries between rocks and lodges itself tightly in crevices by inflating itself.In the Common Chuckwalla, depending upon the population, male coloration may include black head, forelegs and upper trunk, and reddish-yellow toward the rear or a showy bright red body. Females are usually a much less showy gray or brown with little pattern. :: Chuckwalla is a Spanish-skewered version of the name of a Shoshone Indian tribe, the Cahuilla.