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