Sanderlings Tagged with Color-Rings (IMAGE) University of Groningen Caption Sanderlings have been tagged with color-rings to make them individually identifiable. The study is based on tens of thousands of observations of such tagged birds. Credit Jeroen Reneerkens Usage Restrictions With 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.