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....
NIKON CORPORATION NIKON D300, f/8 @ 420 mm, 1/500, ISO 400, No Flash
Lil Judd aka LilKnytt Photography (c)