Morbo, you please me with that subject! <img src="/ubbthreads/images/graemlins/kissyou.gif" alt="" />
It is a pain that I don't have the time to read & answer well yet. <img src="/ubbthreads/images/graemlins/cry.gif" alt="" /> But... I will be back soon!! <img src="/ubbthreads/images/graemlins/devil.gif" alt="" />
The example I vaguely recall was a bird being introduced to an island by explorers a few hundred years ago, which developed a different beak to adapt to the available food sources (I think it became shorter and stronger, to break nuts which were tougher to crack than their normal food).
Such experiences & observations were made involving several species. What is the most perticular with the bird experiments that you talk about is that it was on those finches from the different Galapagos Islands (among a few other species) that Darwin funded its theory on the origin of species by the natural selection; and that confirmed it several times after.