When the desert iguana matures, its growth ranges from ten up to sixteen inches long. The body becomes rounded and large. The tail grows long. The head becomes brown-colored which specifically follows a netlike outline that is reddish brown in hue. The trunk and the neck of the desert iguana contain tan and grayish spots. Meanwhile, its tail possesses some white or grayish spots. During the most extreme hot periods, the desert iguana climbs into the bushes to seek for cooler areas. But despite the condition of the climate, the desert iguana remains active even during 115 degrees F. The photos below were taken on our San Andreas Fault Tour!