Is this a finch?
I'm seeing an unfamiliar bird at feeder and on exposed ground. My location is Adirondacks, and its the end of February. The bird is The size of a sparrow(give or take),is totally white on brest and under wings, the face is white with some light brown, yellowish beak, the backside is mostly black with some white parttern stripes. They are always in their group of about 30 birds, flying away and returning as the group. They fly in what appears to be an undulating motion like that of a finch. They actually appear to be some sort of finch in winter plumage.? Any Help identifying this bird would be greatly appreciated. Thank you.