Study map (IMAGE) Princeton University Caption A key difference of the Princeton research was that it included observations of the high-tide period when the middle and lower tidal flats are underwater. The researchers focused on the East Asia-Australasian Flyway, which spans from Australia to Siberia along the rapidly developing coast of China where birds stop to rest and refuel. The researchers studied birds at two well-known stopover sites in the Yellow Sea region, Nanpu (b) near Beijing and Rudong (c) outside of Shanghai. The dark squares indicate the study plots along the upper, middle and lower tidal flats (dotted area). The white areas represent the sea beyond the low-tide line. Credit (Image by Tong Mu, Department of Ecology and Evolutionary Biology) 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.