Larus michahellis (IMAGE) University of Barcelona Caption The study by the Group on Seabird Ecology of the University of Barcelona reveals extreme changes in the feeding patterns of the yellow-legged gull over the last twenty years. Credit Raül Ramos (UB-IRBio) 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.