Why have some evolutionary lineages produced many more species than others? As far as one large group of birds is concerned, being in the right place at the right time is a plausible answer.
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Harvey, P., Purvis, A. Opportunity versus innovation. Nature 425, 676–677 (2003). https://doi.org/10.1038/425676b
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DOI: https://doi.org/10.1038/425676b
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