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Interesting, though personally I think the bird in your picture looks very very similar to the one in this post, so I still have reservations as to which morph it is, but I wonder if seema would be able to give us a better idea since she saw it more closely!
I would think a Myrtle would show a much paler throat. I've been seeing tons of Myrtles lately, and I've had them all Winter and haven't found one with a throat this dark. Even the dark-throated Myrtles' throats are paler than this birds. Here's the darkest Myrtle I've seen: http://mw2.google.com/mw-panoramio/photo...
It's hard to tell, but based on the wing bars and seemingly paler throat, it seems more reminiscent of the Myrtle morph of the Yellow-Rumped Warbler, though their ranges essentially completely overlap.
The "Audubon's" Warbler is a subspecies of Yellow-rumped Warbler (Setophaga coronata).
I'm pretty sure it's a Yellow-Rumped Warbler, but not positive.
Spotted on Apr 30, 2012 Submitted on Apr 30, 2012