I seem to recall that someone reported an albino here and thought it was a cardinal, someone else thought it was a white-throated or fox sparrow. Sorry I cannot find that post now to respond to, despite searching. Anyways, I saw this(?) bird yesterday, and to me it looks like a song sparrow. It was foraging on the ground, and not with the two-legged scratch/kick that the 2 aforementioned sparrows use. It is not an albino, but is missing 98% of its pigment. It has very faint brown streaking on back and breast, and malar stripe. It was quite easy to see, along the lowest path east out of the farm, between the Meeting House building and the pond below it, sometimes sitting right on the fence next to the path.
A challenge for you photographers! Go get it!