I found a Leucistic Common Redpoll this morning at the Yellow-Bellied Bog on Perry Road in Sax-Zim Bog … a most “uncommon redpoll!” Normally I do not like to take “feeder photographs”, but in this case it helps show you the difference between a redpoll with normal pigment, and one without, Leucism (Wikipedia link).
Feeder Videos with the Leucistic Common Redpoll (subscriber video links: video one & two)
Common Redpoll feeding frenzy (subscriber video link: video three)