Tweeters,
It turns out that several of you have seen a Red-winged Blackbird with a mutation much like the one I have in the yard. Few and far between but it's something that's out there to look for. It's not leucistic, but another type of mutation. Why does it occur? Maybe some DNA specialist will find out someday.

May all your birds be identified, even the weird ones,
Denis

Denis DeSilvis
avnacrs 4 birds at outlook dot com