Skinks (IMAGE) University of Chicago Press Journals Caption The P. skiltonianus species group includes two size-differentiated species that are widespread in western North America. Top: An adult female P. skiltonianus from San Luis Obispo County, California Bottom: Adult male P. gilberti from Yuba County, California. The bright red head coloration indicates a male in breeding condition. Credit Top: Brad Alexander © Bottom: Ackson Shedd © Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.