We observe closely related species in sympatry and infer how they evolved from a common ancestor.
More Quotes from Peter R. Grant:
Plumage features constitute a major component of courtship signals.Peter R. Grant
Almost nothing is known from hybridization studies about the inheritance of courtship behavior of females, or of their responsiveness to particular male signals.
Peter R. Grant
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
Evidence of epistasis from hybridization studies is more scarce.
Peter R. Grant
The theory of founder effects does not explain how novel features like plumage traits arise.
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
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