I've not mentioned this before, because I can't remember the details.
An ex-girl friend of mine had a book called, something like, 'Darwin's Finches'. It was a very detailed account of long term studies of finch populations on the Galapagos Islands. If I remember correctly it purported to show that these significant birds are still changing and in accordance with the principles of evolutionary theory. Has anyone else encountered this book and does anyone know where I could get another copy? The 'ex' is a bit too 'ex' now to ask!