Photographically this is not a great picture. I had to sacrifice too many pixels by cropping the image in order to show you this little warbler. I wouldn't do that if it wasn't a first sighting for me. I was actually focussing on a Yellow-rumped Warbler right in front of me when I saw this one landing on a boat dock nearby. No chance to move in closer, just time enough to point the lens, focus, and fire the shutter.
The Prothonotary Warbler can be found in Eastern Iowa during the summer and maybe I have a second chance to see this wonderful looking bird again...