Sounds like you were seeing common yellowthroats.
wjansen
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On Fri, 30 Jun 1995, Anna Coles wrote:

> A friend saw 3 interesting birds last evening, in a meadow area near
> Sultan. She wonders if they were indeed American Goldfinches, which was
> the closest picture in the bird book (Audubon's photo bird guide). There
> were two males and one female: the female was a drab greenish/yellow,
> while the males were both neon-yellow, but the caps were just over the
> bridge of the beak and did not go up to the crown of the head as the
> photo showed. There was also a bit of white on the lower belly and on
> the undertail coverts. The size was similar to a Red-breasted Nuthatch.
>
> Could the two males have been changing to mature breeding plumage? What
> are the chances that the two males were the female's offspring? Thanks
> in advance! --Anna Coles, Seattle, WA acoles at u.washington.edu
>