Date: 8/9/17 2:35 pm From: Joel Geier <joel.geier...> Subject: [obol] Interesting MacGillivray's Warbler in oak savanna, northern Benton County
To add one more to the list of surprising oak savanna birds, this morning at a Vesper Sparrow monitoring site I tracked down a bird that was chipping in a big serviceberry bush, and found what appeared to be an adult male MACGILLIVRAY'S WARBLER.
What was odd, though, is that the white eye ring seemed to be complete, and the arcs above and below the eye weren't as thick as they usually look on MacGillivray's Warblers.
The idea of Mourning Warbler came to mind, so I stayed on the bird as it hopped around through the foliage, focusing especially on the "bib" area. This looked normal for male MacGillivray's, variable dark gray but without a distinct blackish area.
I also got a quick look at the undertail as the bird tipped up at one point, and noted that the dark gray/blackish rectrices were fairly long relative to the yellowish undertail coverts.
I just had a chance to look through a warbler guide now, and see that all of this except for the eye ring points more to MacGillivray's rather than Mourning Warbler. So I'm inclined to view this as a slightly unusual MacGillivray's.
I'd be interested to hear if others have seen MacGillivray's Warblers with complete (or nearly complete) eye rings