[Maine-birds] late broods for Yellow rumps

I was working in the barn this afternoon when a yellow-rumped warbler swooped in and began busily collecting chicken down feathers and bits of hay.  Flew off into the woods and made several trips.  Seems a bit late for another brood but maybe since they stay late often they have more time for nesting?  I do still have bluebirds and phoebes with active broods, but the Bluebirds got going late and the Phoebe pair usually manage 2-3 broods anyway. 

Sarah