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Evolutionary biology

Oh sibling, who art thou?

Help from earlier offspring in rearing a subsequent brood should evolve more easily when the mother is strictly monogamous. A comparative study of birds provides evidence in support of this view.

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Figure 1: Monogamy and cooperation.

GEOFFREY DABB

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Cockburn, A. Oh sibling, who art thou?. Nature 466, 930–931 (2010). https://doi.org/10.1038/466930a

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