So this is from about 3 years ago. Taken out the front window about a week after we got home in April. I had some new feeders and they were very popular with your LBB's.
You can see the color change on a few of the little buggers backs. And some of the dark ones may be male but I can never tell at this time of the year. 
So ask Brian what field marks he uses to tell winter plumage males from females. Maybe I just haven't been paying attention since they are always around.
Thunderstorm,
Gotta go.
Love,
Nancy
I'm thinking that they are immature goldfinches; the book I found bears that out.
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