Probably the most well-known example of natural selection in action is that of the finches observed by Darwin in the Galapagoslslands. As Darwin commented in his Journal of Researches(more popularly known as the The Voyage of the Beagle), "The most curious fact is the perfect gradation in the size of the beaks in the different species of Geospiza, from one as large as that of a nch to that of a chaffinch, Seeing this gradation and diversity of structure in one small intimately related group ofbirds, one might really fan that from an original paucity of birds in this archipelago, one species had been taken and modified for different ends.