An analysis of more than 2,000 species of bird provides insight into how the animals' diverse beak shapes evolved, and points to a single rare event as a trigger for the rapid initial divergence of avian lineages. See Letter p.344
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Bhullar, BA. Catastrophe triggers diversification. Nature 542, 304–305 (2017). https://doi.org/10.1038/nature21494
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DOI: https://doi.org/10.1038/nature21494