Jakob Krieger, University of Greifswald (IMAGE) Max Planck Institute for Chemical Ecology Caption This shows Jakob Krieger holding a giant robber crab tagged with a GPS tracking device. Credit Jakob Krieger, University of Greifswald Usage Restrictions None 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.