please help identify this bird

This small black and white bird appeared with a mixed flock of black-eyed juncos and white throated sparrows about a week ago, northern Ga. in a fairly forested area. In all ways, it's feeding and other behavior matches the juncos. For a couple days I was excited that it was possibly a black and white warbler, but have only observed it feeding on the ground, never climbing up trees or any nuthatch-like behavior. It's size corresponds with the junco's (there is a junco in this picture, lower left, for comparison). Bill is similar to a junco or sparrow, pink. Breast is white. Photos showing other perspectives to follow. THANKS FOR YOUR HELP!

profile showing tail and wing markings

Try the Bird Identification forum if it doesn't get ID'd here!!
http://davesgarden.com/community/forums/f/birdid/all/

Probably a partial albino Dark-eyed Junco.

Resin

Thank you both: I had suspected a mutation, but didn't know for sure that was a possibility. The explanation of a "partial albino dark-eyed junco" is very satisfying.