Grassy slopes (IMAGE) Canadian Museum of Nature Caption The grassy slopes and rocky ridges where the scientists live-trapped the East European voles to monitor their populations. Credit Dominique Fauteux Usage Restrictions For use with stories about the study. 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.