[Maine-birds] ID help for a warbler on Monhen

Can anyone tell me who this little guy/gal is with a grenish head? The ony warblers I can think of with greeish head are Chestnut-sided and Black-throted Green. My guess is the Black-throated Green, even though it lacks the black throat and typicl facial features. Taken on Mohegan Island May 23, 2016. It only stuck around long enough for one picture.

https://flic.kr/p/Hudyix

Thank you,

Bill Blauvelt

Portland, ME

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