Wildlife Spotting

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/photos/medium/70799477.jpg

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.