Decline of shorebirds (IMAGE) Faculty of Sciences of the University of Lisbon Caption On the image, sanderlings (Calidris alba) and one dunlin (Calidris alpina). The decline of shorebirds is a global phenomenon for which the causes are not yet fully understood. Credit Paul F. Donald. Usage Restrictions Attribution is required. 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.