Snow Goose

Here's a lone snow goose hanging out with a flock of Canada geese. Why? I have no idea. But it's a snow goose, as evidenced by its size, the overall white body, the black wing tips (appearing as a what seems to be a black tail) and the "grimace" on the beak. 

This is the first time I've seen a lone goose like this with Canada geese.

Here the bird is with some Canada geese for size reference.

 Note the black wing tips (looking like a black tail here) and the "black lips" on the pink beak.

And another profile.