[EBB Sightings] White Bird, ID uncertain

Today while hiking in Sunol (McCorkle Trail, about 1/4 mile above the intersection with Canyon View Trail) we saw a mostly white bird.  It was foraging on the ground with several juncos, and appeared to be slightly larger than the juncos.  Pink bill, white breast and back, black eye stripe, and black striped tail area.  My husband got some pictures:

www.chabotcollege.edu/faculty/sstanton/WhiteBird_1.htm


www.chabotcollege.edu/faculty/sstanton/bird2.htm

The first picture also has a junco in the frame.  

(You may have to be patient, the Chabot server is slow.)

At first I thought it might be a bunting, but it doesn't really match up.  My best guess is leucistic junco, but I am open to other suggestions.

Sue