Wednesday 13 September 2017

[cobirds] Philadelphia Vireos Barr Lake (Adams Co)

Today Tom Whitten and I saw Philadelphia Vireos at Barr Lake in Adams County, in two different locations.
First one was on the trail that runs from the banding station east then north, on the west side of the small pond just off of the boardwalk to the viewing blind. A bright bird, tucked in deep in willows, working 4 to 5 feet above ground.

Second one was no more than 100 yards from the boat ramp parking area going towards the banding station. Working low as well, mostly near the ground but went up and down. A drab bird, thus it took a bit of time to separate from Warbling, although it didn't look right for Warbling from the start. Even this paler bird had much more yellow underneath, especially throat and undertail coverts. This bird seemed smaller than Warbling overall, mostly due to a shorter tail, the head looked less angular, bill even seemed a bit smaller, but the most interesting thing separating it from Warbling was in addition to the prominent curved white line above the eye, it had small but quite noticeable white below the eye (dark lores making it stand out more).

Dan Stringer
Larkspur, CO

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