Graphic summary (IMAGE) Royal Netherlands Institute for Sea Research Caption Analysis of amino acid δ15N 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.