Goldfinch with Bull Rush Feathers

This Goldfinch is determined to have a comfortable warm nest.
  It was working like a slave to tease the feathers out of the Bull Rush heads.
  It returned to the same head,time after time.
I only wish there had been a little more light!
  It was in a half shade situation.Must go back again to see if I can get a little closer.
  The Great Tits were doing the same thing too!