FIGURE 1. Beak morphology (sketches reprinted15) and representative sound spectrograms of songs from eight Darwin's finch species on Santa Cruz Island (from top to bottom: G. magnirostris, G. fortis, G. fuliginosa, G. scandens, C. parvulus, C. psittacula, C. pallida , C. olivacea).

From the following article:

Correlated evolution of morphology and vocal signal structure in Darwin's finches

Jeffrey Podos

Nature 409, 185-188(11 January 2001)

doi:10.1038/35051570

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Interspecific variation is apparent in both morphology and song structure. Comparability of the songs of different species is supported by the young age of the clade19, and the striking uniformity among species in the structure of the syrinx and associated musculature22. See ref. 16 for a discussion of homology among Darwin's finch songs. Spectrogram frequency resolution, 98 Hz; scale bar, 0.5 s.

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