Cover illustration
July 10, 2007; 104 (28)
Cover image: Adélie penguins at Cape Crozier, Ross Island, Antarctica. Penguins wear deep furrows in the ice trekking to and from the colony to feed their chicks. Isotopic analysis of Antarctic penguin remains reveals an abrupt shift to a diet of krill within the past 200 years, coincident with the onset of industrial whaling in the region. See the article by Emslie and Patterson on pages 11666–11669. Image courtesy of Steven D. Emslie.
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