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COVER In superb fairy-wrens (Malurus cyaneus), helper males can assist females by providing extra food to their chicks. When this is the case, females lay smaller eggs that give rise to lighter chicks. Females benefit from increased survival. See page 941. Photo: BIOS Ruoso Cyril/Peter Arnold Inc.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)