This eumelanin-challenged (erythristic, pending further research) Swamp Sparrow was photographed in Halifax, MA on September 29, 2014. A detailed note, along with photos of a very similar specimen from the Yale Peabody Museum, will appear in an upcoming issue of The Connecticut Warbler. Much thanks to Mark Szantyr, Julian Hough, Louis Bevier, and especially Jake Musser for their help in identifying this stunning bird both to species and apparent plumage abnormality.
For now, at least, I am going to refrain from getting into much detail about this bird. I do plan to post a copy of the piece that Jake and I are putting together, whenever that is done, which would explain the identification, describe the abnormality, and show photos of the similar specimen for comparison. So, more later.