East European vole (IMAGE) Canadian Museum of Nature Caption An East European vole on Spitzbergen island. These animals were introduced to the Svalbard islands over a few decades. With no predators, their presence provides scientists with a living system to assess the impacts of predators on the populations cycles of small Arctic mammals. Credit Nigel Yoccoz 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.