Song repertoire size varies with HVC volume and is indicative of male quality in songsparrows (Melospiza melodia)

Song Sparrow (Melospiza melodia) Science Article 9

abstract

Complex birdsong is a classic example of a sexually selected ornamental trait. In many species, femalesprefer males with large song repertoires, possibly because repertoire size is limited by the size of songcontrol nuclei which reflect developmental success

Jeremy A. Pfaff et al, Proc. R. Soc. B (2007) 274, 2035-2040

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