Manuel Castellote at work (IMAGE) Frontiers Caption Manuel Castellote taking part in fieldwork. Photograph by Andrea Gilstad. Credit Andrea Gilstad Usage Restrictions Image owned and provided by the authors and must be credited to Andrea Gilstad. License Original 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.