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Here, the authors develop software that uses photographs of birds to extract information on plumage UV reflectance. They use these data to show that UV reflectance is phylogenetically conserved and associated with the light environment.

What factors explain variation in the pace and trajectory of evolutionary divergence between lineages? Here, the authors show that a proxy measure for sexual selection intensity predicts both the rate and direction of plumage colour evolution in a diverse radiation of New World passerine birds.