That's not what is shown in my Nat Geo field guide to N American birds. Dark eyed junco sub sp dorsalis has a black/grey bill(last link in series), however, I am inclined to agree that it isn't junco because of the mottled feathering, which I hadn't noticed before. Also dorsalis tends to be a SW bird, according to what I've found, and this is the NW. Still, I want to see if I had the original photo that this was cropped from for size difference as that would point to towhee. If it's the same size as the junco, then I have to look further - all part of the confirmation process in an ID. Also I'm trying to see the eye on this guy, which looks dark to me, and the towhee clearly has a reddish eye - they're pretty common near my house, although I"ve never had the pleasure of seeing a juvenile. Not so sure about 8,000 feet up a mountain, and definitely not sure about flocking with juncos as the spotted around here will feed with other birds, but don't stick in the groups as a rule.
Pictures of juncos with dark bills:
http://www.google.com/imgres?imgurl=http://www.roysephotos.com/zcDarkEJuncoRB1.jpg&imgrefurl=http://www.roysephotos.com/DarkEyedJunco5.html&h=535&w=700&tbnid=3RsvwKiCCoZR3M:&zoom=1&docid=TLI15qmQZxO21M&ei=qmTaVOzhL8GsogS2g4LoBg&tbm=isch&ved=0CCoQMygIMAg adult
http://www.google.com/imgres?imgurl=https://farm8.staticflickr.com/7248/7628834892_fd5c6fbcf0_s.jpg&imgrefurl=http://www.inaturalist.org/taxa/119152-Junco-hyemalis-dorsalis&h=739&w=1024&tbnid=sJo7tpd2m52GxM:&zoom=1&docid=smokHDEm4OhGuM&itg=1&ei=qmTaVOzhL8GsogS2g4LoBg&tbm=isch&ved=0CDMQMygRMBE juv
http://www.google.com/imgres?imgurl=http://images.nationalgeographic.com/wpf/media-live/photos/000/169/overrides/dark-eyed-junco_16935_600x450.jpg&imgrefurl=http://animals.nationalgeographic.com/animals/birding/dark-eyed-junco/&h=450&w=600&tbnid=M-DEf0s5979KGM:&zoom=1&docid=gxniIgUzknP3eM&ei=rmTaVNGDEJCoogTkuIKICw&tbm=isch&ved=0CCIQMygAMAA Nat geo(lower right corner)
I'm going to have to did up my originals for size comparison. It was flocking with oregon juncos and I don't remember there being such a size difference. But it certainly looks right. And in the junco family, subspecies dorsalis has a grey/black beak, but it's tail should be shorter.
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