Peter R. Grant : (4)

" 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

" We observe closely related species in sympatry and infer how they evolved from a common ancestor. " - Peter R. Grant

" Exchange of breeding individuals between two populations tends to homogenize their gene pools. " - Peter R. Grant

" 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