Graphic summary (IMAGE) Royal Netherlands Institute for Sea Research Caption Analysis of amino acid &delta;15N helped reveal the trophic structure and habitat use of cetaceans from the oceanic waters of the western South Atlantic. Credit Image: Genyffer C. Troina. Cetacean illustration by José Luis Vázquez, adapted from Bastida et al. 2018 Usage Restrictions Please give due credits and use the caption provided. 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.