Why do marine endotherms eat gelatinous prey?

There is growing evidence that gelatinous zooplanktonic organisms (“gelata”) are regular prey for marine endotherms. Yet the consumption of gelata is intriguing in terms of the energy reward, because endotherms have a high energy demand and the consumption of gelata provides little energy return. In this paper, we take advantage of recent advances in diet analysis methods, notably animal-borne video loggers and DNA analysis in seabirds, to...