Mon, 06 Feb 2017 06:30:05 GMTBY HEATHER DEWEY FOR THE PUEBLO CHIEFTAINOn the islands of San Esteban, Roca Lobos, and Pelicanos in the Gulf of California, you will find the largest of the chuckwalla species. Growing upwards of 30 inches long, this type of chuckwalla is endemic to the previously mentioned islands.