Lesser Goldfinch

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.

But you can always ask Liam.

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-goldfinch

Yes the American do migrate here but you don't see them much.

First image looks like a black cap to me

Looks like a Lesser. The American in winter plumage lacks the black crown. http://colintalcroft.com/Sonoma_County_Bird_Watching_Spots/Lesser_Goldfinch.html

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.