Grey seals in the Dutch Wadden Sea. (IMAGE) Royal Netherlands Institute for Sea Research Caption Grey seals in the Dutch Wadden Sea. Photo: Jeroen Hoekendijk (NIOZ / WMR) Credit Jeroen Hoekendijk (NIOZ / WMR) Usage Restrictions Credit must be given to the creator. License CC BY 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.