I am not an ornithologist but I do have a question. The bird that was found by Cesar Castillo, can it be a hybrid of a Nashville Warbler and Orange-crowned Warbler? In the academic literature I have read about that weird hybridization of these two species and the marked white eye rings of this bird could be a trait inherited from the white eyering of the Nashville. I am bringing this question up since most comments indicate that this alleged Orange-crowned Warbler (ORW) does have unique characteristics not seen in other ORWs.
Felipe > On Dec 20, 2017, at 10:11 AM, Kevin J. McGowan <k...@cornell.edu> wrote: > > 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. > > Kevin > > > -----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: > > https://flic.kr/p/21mj9ge > > 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. > > Best, > Shai > ________________________________________ > 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 > > > -- > > NYSbirds-L List Info: > http://www.NortheastBirding.com/NYSbirdsWELCOME.htm > http://www.NortheastBirding.com/NYSbirdsRULES.htm > http://www.NortheastBirding.com/NYSbirdsSubscribeConfigurationLeave.htm > > ARCHIVES: > 1) http://www.mail-archive.com/nysbirds-l@cornell.edu/maillist.html > 2) http://www.surfbirds.com/birdingmail/Group/NYSBirds-L > 3) http://birding.aba.org/maillist/NY01 > > Please submit your observations to eBird: > http://ebird.org/content/ebird/ > > -- > -- NYSbirds-L List Info: http://www.NortheastBirding.com/NYSbirdsWELCOME.htm http://www.NortheastBirding.com/NYSbirdsRULES.htm http://www.NortheastBirding.com/NYSbirdsSubscribeConfigurationLeave.htm ARCHIVES: 1) http://www.mail-archive.com/nysbirds-l@cornell.edu/maillist.html 2) http://www.surfbirds.com/birdingmail/Group/NYSBirds-L 3) http://birding.aba.org/maillist/NY01 Please submit your observations to eBird: http://ebird.org/content/ebird/ --
