This is the only bird I can think of, even though you didn't mention any red.
http://www.coffeecreekwc.org/photos/...ird_(male).jpg
Did you see the bird's body? Maybe it's beak shape? That might help jog my brain.
ETA:
Could possibly be a Meadowlark:
http://www.lewis-clark.org/media/ima...eadowlark.jpg\
or a Golden Finch
http://images.google.co.uk/imgres?im...%3D1%26hl%3Den
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