The adaptive genomic landscape of beak morphology in Darwin's finches

Beak shape in Darwin's ground finches ( Geospiza ) is emblematic of natural selection and adaptive radiation, yet our understanding of the genetic basis of beak shape variation, and thus the genetic target of natural selection, is still evolving. Here we reveal the genomic architecture of beak shape variation using genomewide comparisons of four closely related and hybridizing species across 13 islands subject to parallel natural selection....