Justin's 3rd photo also bears on another point that hasn't received
any discussion yet (I think): The overall shape of the head.
MacGillivray's Warbler has a rounder-headed appearance than Mourning
Warbler. To me, the bird in photo #3 has a flattish-looking head,
more consistent with Mourning Warbler.
Quoting Justin LeClaire <[log in to unmask]>:
> Hey birders,
> I am the one who took the photographs of the highly debatable
> Mourning/MacGillivray's Warbler last Saturday at the Brilyea access. I
> received an email from Dave Hoag the other day informing me of programs
> that allow you to recover deleted or otherwise lost photos from compact
> flash cards, and last night I tried one of these out and did get a result.
> I had taken 11 pictures in all of the warbler and had deleted all but the
> two that I put on flickr as many of you know, and I was able to recover one
> additional photo using a recovery program. Most of the pictures turned out
> to be corrupted and grayed out, however this one only had partial gray in
> it and gives an additional angle that may help with the undertail covert
> discussion. The link is below. A rare/unusual bird report has been filled
> out and sent to the Vermont Bird Records Committee for evaluation. I hope I
> haven't dragged this out too much for everyone.