Other points to look at on this bird are the dark legs (MacGillivray's are 
pale), and the undertail coverts that barely extend past the folded wings 
(longer in MacGillivray's). MacGillivray's also has a pale base to the lower 
mandible and a slightly down-curved bill. This bird has an all-dark, very 
straight bill. The slope of the forehead differs between the two species, too, 
with MacGillivray's having a more sloping profile.

Just looking at the books, one would never expect to confuse these two species. 
It just goes to show that you often can't rely on the big fieldmarks; you need 
to look at the small ones too.


-----Original Message-----
From: bounce-122145491-3714...@list.cornell.edu 
[mailto:bounce-122145491-3714...@list.cornell.edu] On Behalf Of Shaibal Mitra
Sent: Wednesday, December 20, 2017 7:25 AM
To: NYSBIRDS-L <nysbird...@list.cornell.edu>
Subject: RE: [nysbirds-l] OCWA or MGWA

Hi Bob and all,

Orange-crowned Warbler does show white eye arcs:


What looks odd on the Queens bird is the degree of contrast between them and 
the adjacent feathers. I would even go further and say that in terms of shape, 
the Queens bird's eye arcs are a much better fit for Orange-crowned than for 
MacGillivray's. In Orange-crowned, the eye arcs look like portions of perfect 
semicircles, with small gaps fore and aft. In MacGillivray's, the upper arc in 
particular is shorter and straighter, which in combination with the thicker, 
blacker pre-ocular, gives the impression of a stern countenance. 

Longtime participants in bird ID debates will recall several instances in which 
extremely experienced people have debated and not agreed on the identity of an 
individual Oreothlypis, as Orange-crowned vs. Nashville, a struggle that 
underscores the degree to which Orange-crowned can appear eye-ringed and bright 
yellow below.

From: Robert Paxton [r...@columbia.edu]
Sent: Wednesday, December 20, 2017 6:11 AM
To: NYSBIRDS-L; Shaibal Mitra
Subject: Re: [nysbirds-l] OCWA or MGWA

Hi Shai et al.,
   No one seems to be commenting on the bright white semi-circles above and 
below the eye. I have never seen this feature on an Orange-crowned Warbler.
  Bob Paxfon


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