To summarize, the particular song a male sings, and the behavioral responses of females to song and morphological signals, are not genetically inherited in a fixed manner but are determined by learning early in life. Peter R. Grant Read Quote
Species can be recognized by their morphological characteristics and songs. Peter R. Grant Read Quote
We observe closely related species in sympatry and infer how they evolved from a common ancestor. Peter R. Grant Read Quote
Thus the genetic basis to the origin of bird species is to be sought in the inheritance of adult traits that are subject to natural and sexual selection. Peter R. Grant Read Quote
Islands are known to differ in the food supply available to ground finches, mainly seeds. Peter R. Grant Read Quote
The independent role of morphology in mate choice is revealed by the rare instances where the usual association between song and morphology is disrupted. Peter R. Grant Read Quote
