I glanced out the window yesterday morning and saw a little white-headed bird hopping around on the ground, under the bird feeder. I decided it was behaving like a dark-eyed junco even before I noticed that it was surrounded by normal juncos.
The black head had been replaced by snow-white coloration. Everywhere it went, my eye followed while the other birds disappeared into the leaf clutter.
I have seen "white" blackbirds before but this was new to me. I'll remember the camera next time.