The chuckwalla is found in the southwestern United States and northwestern Mexico.It is an herbivorous lizard that can be active in temperatures as high as 39oC (102oF). When disturbed it seeks shelter in rock crevices and gulps air, wedging itself in a crack, thus making it extremely difficult for predators to extract it. Reaching up to 46 cm (18'') in length, it is one of the largest lizards in the U.S. (second only to the gila monster).
The above picture was taken at St. Louis zoo, in May 2002.
Life on Earth