I was out of town from 21–30 June and no surveys were run during that time. On June 30th, however, I heard from Dawn Brown and Corey Riding that there were three casualties at the southwestern alcove of the Noble Research Center: a badly decayed Northern Parula (adult male), a female Ruby-throated Hummingbird, and a female (with brood patch!) Indigo Bunting. It’s possible that the bunting came in on the 30th, but the others were clearly killed prior to that date. (Photos by Dawn Brown.) This is officially the first Northern Parula found on the project.
Today I found a stunned Lincoln’s Sparrow on the south portico (no photo).
The bird couldn’t fly well, but it could fly. I decided to give it the “perch test” to determine if I should consider it to be a casualty or simply a trapped bird. Once able to catch it, I walked the bird south toward Edmond Low Library and found it a dense and secluded place to perch and rest where it might feel protected – or at least better protected than out in the open of the portico. I was pleased to see that the bird grasped a branch strongly and seemed to perch well. This one had me on the fence a bit, but I ultimately logged it as trapped. Though stunned, it seemed otherwise healthy with fat score = 2.
We finally had a decent cold front push through with the first nip of autumn in the air but, unfortunately, it also brought us the first Lincoln’s Sparrow casualty of fall. This was an AHY-U, bulging with fat (scored it a 3). This one is also the first window casualty in front of a treated window. I can’t tell if the bird flew into an untreated pane above the treated area or if it hit one of the treated panes. That’s a design flaw of my study, stemming from the logistical challenge of treating such large expanses of glass.
Lots of birds were moving through campus today. I found a pair of Brown Thrashers and this Grasshopper Sparrow flitting around the plantings in the southwestern alcove.
The photos illustrate how obvious it is to find many of the carcasses at the Noble Research Center. Today it was an Indigo Bunting in the southeast alcove.
This was a hatch-year bird and probably a male owing to the faint bluish tinge in the wings and tail. Were those blushes of color resigned to the upper tail coverts, female would be a bit more likely. Fat = 0 on this bird.
That southwestern alcove continues to get a workout this fall, but again, the unfortunate victim was found in front of untreated glass panes.
Today it was a hatch-year (HY) Nashville Warbler; sex undetermined with fat score = 2.
When I found the bird in position on the cement as indicated in the above photo, it had already been heavily scavenged by ants. I moved the carcass to a location on the grass on the north side of this southwestern alcove (see photo, top right) to set up a removal trial.
So far, it’s exclusively been the southwestern alcove causing the problems this fall. That’s a bit ironic and potentially problematic, as I’ve completed more window treatments there than anywhere else on the building. However, none of the four birds that has ended up there has been found in front of a treated window, leaving open the suggestion that the treated windows have not cause any casualties, even if casualties have occurred at the partially treated alcove.
This morning, I found the first bird actually in front of a treated window pane: a Northern Waterthrush. The hopeful difference is that this bird was ALIVE.
Above right – Yep, that little white dot in the photo on the right is waterthrush splay in front of the window where I first encountered the bird.