Evolutionary changes in the beaks of Darwin's finches have been instrumental in the adaptive radiation of these birds. The molecular basis for variation in beak size and shape is opening up to investigation.
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Patel, N. How to build a longer beak. Nature 442, 515–516 (2006). https://doi.org/10.1038/442515a
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DOI: https://doi.org/10.1038/442515a
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