The beak of this finch has obviously evolved to eat sunflower seeds. There is a regular finch fest at my backyard feeder. There are many more house finches than other species. This female didn't prove to be as skittish as her lovelier, reddish male counterpart.
Recognition goes to Jonathan Weiner who wrote the book of the same name, copyright © 1995. I highly recommend this book about two scientists who actually watch and document the finch evolving (in the span of several years) on the Galapagos by studying their beaks and other characteristics.