A discovery of the sound-producing vocal organ known as the syrinx in a bird fossil from the end of the 'age of dinosaurs' highlights the anatomical basis for myriad aspects of avian social and behavioural evolution. See Letter p.502
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O'Connor, P. Ancient avian aria from Antarctica. Nature 538, 468–469 (2016). https://doi.org/10.1038/nature19480
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DOI: https://doi.org/10.1038/nature19480
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