Do bills change colors when plumage does


Problem:

I've been unable to find anything on the Google resembling this bird. I took the photo in Virginia Beach, VA around 2010, October, I think... It appears to be between winter and summer plumage but I'm not sure. I tried looking on whatbird.com but couldn't find anything that really seemed to match up well.

I've added some more photos since people seem to question whether or not the white is snow, for some reason. Also note that most seem to have a red bill with a black tip, while the one with more white on its breast has a largely black bill with just a red band.

Question: Do bills change colors when plumage does, is that a thing, or perhaps it's just an anomaly or a gender trait?

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Biology: Do bills change colors when plumage does
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