Why erect-crested penguins reject their first egg and lay a second one

A new analysis of old data suggests that the endangered erect-crested penguin's bizarre nesting habits—rejecting the first egg they lay—is because they can't feed two chicks, and the second, larger egg has a better chance of success. Lloyd Davis of the University of Otago in New Zealand and colleagues describe these findings and their implications for penguin conservation in the open-access journal PLOS ONE on October 12, 2022.

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