Juvenile female Lesser Goldfinch or Carduelis psaltria
Some may call this a "Pale" adult female. I would say it's a first year juvenile. The juveniles are being pushed around by the mature females. But that's just me.... Note the two very fine long thin feathers at the back of her head. Had it not been for doing this study, I would not have known they were there.
NIKON CORPORATION NIKON D300, f/6.3 @ 420 mm, 1/1250, ISO 400, No Flash
Lil Judd aka LilKnytt Photography (c)