Figure 1.

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Figure 1.

The common cactus finch has a pointed beak adapted to feed on cactus whereas the medium ground finch has a blunt beak adapted to crush seeds. Their hybrid progeny have an intermediate beak morphology adaptive under certain environmental conditions as explained in this paper. Credit: Sangeet Lamichhaney, Rosemary and Peter Grant.
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  • Common cactus finch with its pointed beak feeding on the Opuntia cactus. Photo: Lukas Keller.

    How gene flow between species influences the evolution of Darwin’s finches

    Despite the traditional view that species do not exchange genes by hybridisation, recent studies show that gene flow between closely related species is more common than previously thought. A team of scientists from Uppsala University and Princeton University now reports how gene flow between two species of Darwin’s finches has affected their beak morphology.

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