Autumn migration trajectories (IMAGE) Max-Planck-Gesellschaft Caption Terrestrial birds are capable of flying for hundreds of kilometers over the open sea. Nourani et al. show that the autumn migration trajectories of some of these birds correspond with uplift over the sea surface. Suitable uplift means less drag, making sea-crossing less energetically demanding. Moreover, strong uplift can allow the birds to soar. Credit Elham Nourani / Max Planck Institute of Animal Behavior Usage Restrictions Use of images is limited to editorial coverage of scientific topics relating to the activities of the Max Planck Society. Any kind of commercial use (including, in particular, the exploitation of images by means of sale or incorporation in image databases or image catalogues) as well as any promotional use/use for merchandise purposes, disclosure to third parties or granting of related rights to third parties is expressly not permitted. 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.