We observe closely related species in sympatry and infer how they evolved from a common ancestor.

Image, We observe closely related species in sympatry and infer how they evolved from a common ancestor.

We observe closely related species in sympatry and infer how they evolved from a common ancestor.

—Peter Raymond Grant

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Image, Males transmit signals in courtship through behavioral displays.

Image, Evidence of epistasis from hybridization studies is more scarce.

Image, Species can be recognized by their morphological characteristics and songs.

Image, Almost nothing is known from hybridization studies about the inheritance of

Image, Islands are known to differ in the food supply available to ground finches, mainly seeds.

Image, Closely related species of birds are also chromosomally similar.

Image, Exchange of breeding individuals between two populations tends to homogenize their gene pools.

Image, Plumage features constitute a major component of courtship signals.

Image, The independent role of morphology in mate choice is revealed by the rare instances

Image, Genes that underlie the capacity to receive, use and transmit information are the evolving properties.

Image, The theory of founder effects does not explain how novel features like plumage traits arise.

Image, Thus mating of females was strictly along the lines of paternal song.

Image, The divergence of songs in the new population away from those in the progenitor

Image, To summarize, the particular song a male sings, and the behavioral responses

Image, Thus the genetic basis to the origin of bird species is to be sought in the inheritance

Image, The process of speciation is completed with the cessation of genetic exchange.