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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Andrew Cockburn is in the Division of Evolution, Ecology and Genetics, Research School of Biology, Australian National University, Canberra ACT 0200, Australia. andrew.cockburn@anu.edu.au
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Further reading
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1.
Frontiers in Zoology (2017)
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