21 September 2015 – Common Yellowthroat

As feared, I found this male Common Yellowthroat today, following two days of at least one yellowthroat trapped at the north entrance. Looks like AHY male to me; fat = 3.

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19 September 2015 – Common Yellowthroat and trapped warblers

There were at least three warblers trapped at the northern entrance this morning.  They were frisky enough that I could neither catch them or get a good look at them. I was thinking Common Yellowthroat for at least one of them.  At the south entrance portico, Corey Riding reported a dead Common Yellowthroat (no photo).

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16 September 2015 – Yellow Warbler

I was not able to check the NRC yesterday (9/15), but that’s when I think this Yellow Warbler actually came in and met its end in the northwestern alcove.  I think it’s a HY male; fat = 2. I left the bird in place for a scavenging trial.

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13 September 2015 – Nashville Warbler

Today I found a window-killed Nashville Warbler in the southwestern alcove.  The brownish cast to the upperparts and tapered rectrices suggest a HY bird, sex undetermined.  Fat = 2.  I have included a radar image of last night’s flight on a rare evening that felt a lot more like October than September.

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9–12 September 2015 – no casualties

While there we no casualties during this period, we did have some interesting observations:

On Thursday 10 September, I found an olive/yellow warbler flying around and perching in local trees  near the southwestern corner of the Noble Research Center.  The bird flew strongly, was not trapped, and did not let me get close enough for a decent look and identification.

Overnight Thursday and from about 2:00 am to 9:30 am on Friday 11 September, a powerful cold front and storm pushed through our area with damaging winds and hours of lightning and torrential rain.  I checked the NRC around 8:00 am –  during one of those lightning-lit downpours and found no casualties.  Later that day, Corey Riding found this bedraggled Mourning Warbler near the southwestern alcove, but far enough from the building to make us hesitant to consider it a window casualty:

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12 September was busy around the NRC with tailgaters preparing for a 6:30 pm football game.  I found a local Mourning Dove tucked against the wall near the northeastern alcove (not trapped) and a younger bird (recently fledged) that had died near the east end of the south portico.  The fledgling looked too young to have been a window casualty so I did not count it.  I also flushed a warbler from within the patio area on the east side of the rotunda. In my fleeting view, the bird was yellowish with a noticeably olive rump.

1 September 2015 – Mourning Warbler

I found our 8th Mourning Warbler of the study on Sep. 1, in the southwest alcove. It looked to be an ASY female, but I did not handle it for close examination.  I left it for a scavenging trial.

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The backstory for this bird is that it actually died yesterday sometime after my morning check and before Corey’s 11:30 am check. This was a broad daylight collision.  I counted it here as a Sep. 1 fatality because I wouldn’t have discovered it until this morning had I been on my own.  I would have noticed that the bird was not a fresh casualty, but the best I could have done was say that it died sometime yesterday after my morning search and probably before midnight.  With Corey’s information, we now know that it was in place nearly 24 hrs before I detected it on my own.