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Sexual dimorphism is where the male and female of the species differ in appearance. This dimorphism is assumed to have evolved as a result of different environmental and sexual selection pressures on the two sexes. This means that finch species in which sexual dimorphism does not occur most likely have alike environmental/sexual pressures, and, therefore, alike appearances.

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If finches are in an environment where the more readily available food source are ground objects such as nuts, seeds and berries or there is some environmental event that makes other food sources such as insects more scarce, then larger, rounded beaks which are better for cracking seeds and nuts will become more prevalent in said finches.

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If finches are in an environment where insects are more prevalent or there is some type of environmental event that makes other food sources such as berries and seeds scarce, then thinner, triangle shaped beaks which are better for impaling bugs will become more prevalent in said finches.

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Other finches migrated to environments where there were a lot of trees for them to inhabit so they have more curved feet perfect for perching on branches.

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Of the mainland finches that migrated to the islands some of them migrated to environments where there were less tress so they evolved to have flat feet made for hopping on the ground.

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Triangular Beaks-
insects

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Nuts, berries, seeds, and other ground objects

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Triangle Beak: Insects

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Rounded Beak: Berries and seeds

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Long thin beak: Insects

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Triangle Beak: Insects

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Sexual Dimorphism

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Sexual Dimorphism

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Same Coloration/No Sexual Dimorphism