American water shrew (Sorex palustris). (IMAGE) Aarhus University Caption The small American water shrew, which has an impressively high resting heart rate. Credit Joe Pontecorvo Usage Restrictions None. 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.