Peterson's Warblers and Kauffman's Guides would seem to imply that your 
mystery bird is a Pine Warbler - a first fall female.   There are bright wingbars, 
so it isn't an Orange-crowned; there is, it seems, too much olive (and not 
enough rust, perhaps) for a Bay-breasted; and it has no streaking for a 
Blackpoll.

Davie Rolnick
Rupert, VT




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