Oriole - I have never seen one of these birds before until today when suddenly I saw 7 of them! I called our wildlife biologist to pick his brain and see if he could identify the bird I described. He told me that it sounded like an Oriole, and that they were probably flying through CO on their migration north. Pretty cool! I'll have to see if I can get a better picture of one tomorrow at work. This one I had to crop a little bit (he was pretty far away and flew off when I snuck up on him). I'll give it another go tomorrow.