Hi Joe, I believe what you have there is a leucistic dark-eyed junco! I've seen a few accounts of them here and there.
Here are a couple of links to others: Leuicstic Dark Eyed Junco <https://photography-on-the.net/forum/showthread.php?t=1228072> https://feederwatch.org/blog/featured-photos-unusual-cardinal-leucistic-junco/ -- You received this message because you are subscribed to the Google Groups "Colorado Birds" group. To unsubscribe from this group and stop receiving emails from it, send an email to cobirds+unsubscr...@googlegroups.com. To post to this group, send email to cobirds@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/cobirds/fc0e9f2e-39ab-431a-9e6b-7de16a272a90%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.