A new edition of Peter and Rosemary Grant’s classic account of their groundbreaking forty-year study of Darwin’s finches 40 Years of Evolution is a landmark study of the finches first made famous by Charles Darwin, one that documents as never before the evolution of species through natural selection. In this now-legendary study, renowned evolutionary biologists Peter and Rosemary Grant draw on a vast and unparalleled range of ecological, behavioral, and genetic data to continuously measure changes in finch populations over a period of four decades on the small island of Daphne Major in the Galápagos archipelago. In the years since the book’s publication, the field of genomics has developed greatly. In this newly revised edition of 40 Years of Evolution, the Grants combine the results of their historic field study with genomic analyses of their primary findings, resolve unanswered questions from the field, and provide invaluable insights into the genetic basis of beak and body size variation and the history of this iconic adaptive radiation.