Closely related species of birds are also chromosomally similar.

quote by Peter R. Grant
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Males transmit signals in courtship through behavioral displays.

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Evidence of epistasis from hybridization studies is more scarce.

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Plumage features constitute a major component of courtship signals.

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

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Species can be recognized by their morphological characteristics and songs.

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

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

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

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

quote by Peter R. Grant
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