warbling vireo

Last day in Vermont ,at Berlin Pond. My daughter ID'd a warbling vireo but much to my surprise the 300mm actually picked it up, and in focus , even though it was at the top of the tree.It's a bit dark but I only cropped the photo no light adjustments. I had my sunglasses on and off trying to take photos as my eyes have been pretty sensitive to bright light since the cataract surgery. Or maybe I am just used to cloudy skies living in Binghamton for so long;). BTW if anyone can ID the juvenile in the extra I;d appreciate it > Fi and I had different thoughts on what it is and no firm conclusions even with using Merlin.