This is an articulately written exploration of evolution of finch beaks on the Galapagos islands. The story is most gripping to those, like myself, who enjoy studying the subject of evolution. To the average person, this will be a tedious and repetitive reiteration of changes in bird bills and the theoretical ramifications of those events. The writing becomes circular toward the end. You can hear the author trying to establish the value of "hybrids" as a support for Darwinian evolution, but the conclusion he reaches (and you will too) is that hybridization has the opposite effect of speciation and produces individuals who are most fit. Bummer for Darwin, but an argument in favor of Intelligent Design.