Beak morphology and song features covary in a population of Darwin’s finches (Geospiza fortis)

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Force–velocity trade‐off in Darwin's finch jaw function: a biomechanical basis for ecological speciation? (2009, methodology): “…song parameters as defined by vocal performance are used by Darwin’s finches in mate recognition, although song parameters such as these that vary widely often do provide a basis for species or mate recognition (Nelson 1988; see also Podos & Nowicki 2004; Huber & Podos 2006, Liu et al. 2008).”
Chapter 5 Vocal Performance and Sensorimotor Learning in Songbirds (2009, background): “Second, within one species with wide-ranging beak variation, correlations between beak morphology and vocal performance are quite strong (Huber and Podos, 2006; Podos, 2001).”
Inaugural Article: The secondary contact phase of allopatric speciation in Darwin's finches (2009, unknown): “Assignment probabilities of 5110 were 0.427 to Isabela, 0.282 to Santiago, and 0.244 to Santa Cruz, but 0.000 to Daphne.”
It is all in the head : morphological basis for differences in bite force among colour morphs of the Dalmatian wall lizard (2008, background): “In a population of the medium ground finch (Geospiza fortis), beak size distribution is bimodal, with large beak males producing songs of different frequencies compared to small beak males (Huber & Podos, 2006).”