Rodent Specimens (IMAGE) Field Museum Caption These are rodent specimens at The Field Museum representative of the kinds of specimens de la Sancha contributed to this study. Credit (c) The Field Museum Usage Restrictions Please include credit 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.