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Appendix S1. Large-beaked Geospiza fortis singing. Movie clip recorded at 250 frames per second and slowed down about 10 times. The movie shows a large-beaked Geospiza fortis singing. Note the relatively slow jaw movements and low gape angle characteristic of birds with large bite forces.

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FilenameFormatSizeDescription
FEC_1494_sm_MovieS1.avi6739KSupporting info item

Please note: Wiley Blackwell is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.