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I said I agreed with red-eyes and not the warbling
Not a warbling vireo, no black stripe above eye on warbling.
I agree as the Warbling Vireo would be paler
Wow. A real challenge... at least for me. :) I'm going to throw out a guess... Red-eyed Vireo. According to the Sibley's guide, p. 342, "grey crown, with distinct dark border... long flat crown accentuated by eye-line". Yours looks like it's got the feathers raised on the head, so I'm bypassing the "long flat crown" bit. Anyway, I'm calling it a Red Eyed Vireo.
Lat: 39.12, Long: -80.46
Spotted on Jun 19, 2010 Submitted on Dec 27, 2016