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Greetings, VTBIRDers:

Sorry to be late to the party, but one other thing to consider on the 
Mourning/MacGillivray's challenge is call note. It's fairly distinctive 
in the two species. Mourning issues an odd, flat, almost scratchy "chit" 
or "chet" note; MacGillivray's offers a short, sharp "tik" note. Not as 
easy as it may seem in writing, but it's something to consider if the 
bird resurfaces. Also note that hatch-year Mourning Warblers and even 
some female after-hatch-year birds can show narrow eye-arcs. But this 
bird, with its whitish throat and thicker eye arcs, does look pretty 
good for MacGillivray's. I don't like the tail proportions at all for 
MacGillivray's, but I'm less familiar with that as a field mark.

Best,
Bryan Pfeiffer
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