Plumage features constitute a major component of courtship signals. - "Peter R. Grant"

Plumage features constitute a major component of courtship signals.
Peter R. Grant

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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
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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