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Carduelis psaltria
foothills.
I haven't gone out much lately. I'm planning on going to Moraga to Valle Vista staging area EBMUD. I want to see what's showing up over there.
sorry wrong lake.
I think that this link is excellent.
http://colintalcroft.com/Sonoma_County_B...
Going by it.
In spring and summer it would have a yellow back. Winter olive like the Lesser minus the black cap. Yours is olive back and looks dark on the top of the head.
http://birds.audubon.org/birds/american-...
It could very well be possible that it is not into it's winter plumage,fully?
Looks like a Lesser. The American in winter plumage lacks the black crown.
http://colintalcroft.com/Sonoma_County_B...
You most definitely have American Goldfinch in the winter, check the link I provided. If this were a Lesser Goldfinch, it would have a full black cap, and it does not.