There was a HY Chipping Sparrow in the northwest alcove. The bird had evidently been stepped on or perhaps run over by a maintenance vehicle. I left it in place for a removal trial.
Also, near the main north entrance (actually at a west-facing facade in the corner) was a Mourning Warbler. The bold eyering and long undertail coverts looked tantalyzingly like a Connecticut Warbler. It was, however, an AHY-U Mourning Warbler. The bird was 13.5g and bulging with fat (3).
This was the 10th Mourning Warbler on the project.
Yesterday’s Chipping Sparrow had me worried: it was flitting about so nervously trapped beneath the south portico that I assumed I’d find it dead this morning, from exhaustion if not from something else. Instead, I was greeted today by 2 Chipping Sparrows stuck in that spot this morning. Both are still moving fine and very active, but they’re going to have to figure out that flying down is their only way out.
As for the identification on these birds, I don’t have much to go on. From up in the rafters, I get only very quick glimpses of oblique angles and undersides. I managed these 2 photos today:
To separate autumn Chipping and Clay-colored sparrows, there are a few things on which to focus. In good light, I often rely simply on the warmer, buffier breast, flanks, and crown of Clay-colored to make the call, though I always prefer a clear view of the light brown rump, as opposed to Chippings’ gray rump. There is a gray rump visible in one of my photos (not one I posted), all but clinching Chipping Sparrow as the proper ID.
The head and facial pattern of Clay-colored is bold and conspicuously absent from these birds. Clay-colored shows a bright white mustache; this is absent on the birds in the photo. Also, the birds in the photo show dark lores. This is consistent with Chipping but not with Clay-colored. Thus, I’m pretty confident that these are Chipping Sparrows.
A crisp and cool night following a home football game made for lots of birds on the move and, evidently, quite a few coming into campus. I found this morning 3 dead Lincoln’s Sparrows: southwest alcove, southwest peninsula, and southern portico. I found a dead Grasshopper Sparrow at the northwest alcove.
Trapped birds consisted of a Song Sparrow that I pushed away from the southwest alcove, and a Chipping Sparrow in the rafters of the southern portico, apparently unable to figure out that flying down was the key to getting out.