13 December 2019
Vol 366, Issue 6471

About The Cover

Cover image expansion

COVER Gigantism evolved multiple times in the oceans, especially among filter-feeding organisms. Baleen whales, such as this humpback whale, represent the most recent radiation of gigantic filter feeders and rank among the largest animals ever. Researchers used direct measures of feeding performance and prey quality to determine the energetic drivers and limits that whales encounter at extremely large body sizes. See pages 1316 and 1367.
Photo: Karim Iliya