OK, here's a puzzle for you - this bird was in my famous "bird tree" this morning. It was stark black and white - no "light tricks" - it was as black and white as a woodpecker! It otherwise looked very much like a female red-winged BB, but there was NOTHING brown about it. Also I think it was maybe a bit larger than a RWBB. I sent the photo along to my expert, who sent it on to her experts. Nobody is sure. One guess is a bi-colored blackbird, but they are supposed to be only in CA - this is a long way from CA! Another guess is a RWBB with "color problems." Anybody game to guess?
UPDATE: The consensus is that it is an immature female red-winged blackbird, who just happens to be black and white instead of brown. It was beautiful.