The hoary redpoll is related to the common redpoll. Both species inhabit a similar breeding range, although the hoary redpolls range extends further north. Often during the winter hoary redpolls will mix in to flocks of common redpolls. As you can tell by the pictures above, the hoary is the first pic and the common is the lower, both species look very similar. The hoary usually appear more white than their common cousins.