Northwest alcove. The only thing sadder than the sight of these two birds is the realization that they were probably traveling together.
Whilst I was traveling this weekend, Corey Riding took over monitoring at the NRC for me. On Sunday the 15th, Corey found this Swainson’s Thrush in the northwest alcove. For those keeping score, it’s 20 August 2009–30 April 2016: 2 Swainson’s Thrushes, and 1 May 2016–15 May 2016: 4 Swainson’s Thrushes.
I found this ASY male Swainson’s Thrush this morning in the southwest alcove.
Note the “booted” tarsus. On thrushes the tarsus is smooth, i.e., without a lot of obvious scaling. It’s sort of like the leading edge of the tarsus is wrapped in one huge scale.
The Painted Bunting lasted 2 days at the main north entrance; it has been removed.
Update: I got a call about a “cardinal” that had struck the southeast alcove window at the NRC around 1:00 pm today. The bird was in fact a gorgeous ASY male SUMMER TANAGER (and me without my camera). I was a bit concerned that it was on the ground (a well-meaning woman was offering it some water) and that it let me grab it pretty easily. The bird was pretty feisty, however, and when I took it to the opposite side of the building to see if it could perch on its own among the row of oaks there, it took off and strongly flew up into an adjacent tree. It’s still dusting off the cobwebs as they say, but when I last saw it the bird was perched strongly about 20′ up in a sturdy red oak.
I’ll count this one among my stunned/trapped victims, and I’ve amended the map below accordingly.
In the last few days, the number of Swainson’s Thrushes killed by window collision at the Noble Research Center has doubled from 2 to 4. This one was an after second-year bird with fat = 1.
It’s really odd how predictably unpredictable window collisions can be. In this case, one of the most abundant migrants through our area has only rarely fallen victim to the building I monitor – despite it being a fairly common window-kill in spring at other Stillwater buildings. I’m in my 6th year of near daily monitoring for casualties at the NRC, and during that time I’ve documented Swainson’s Thrush . . .
Is it just happenstance that two Swainson’s Thrushes are killed within a few days of each other in 2016 when the previous two records were 5 years apart? Do the now 3 birds from 2015–2016 indicate that something has changed compared to previous years of monitoring? Do the two birds at the end of April/beginning of May in 2016 indicate that the primary movement of Swainson’s Thrush is a week earlier than typical? My sample is, of course, much to small to help answer such questions, but it is questions such as these that keep me going day after day and year after year . . .
The longest stretch without a casualty in 6 years was broken this weekend, with the unfortunate Swainson’s Thrush below the first confirmed window kill at the Noble Research Center since 19 November, 2015.
If you were in need of evidence to convince you that it is healthy individuals that succumb to window collisions, check out the fat deposits clearly visible in the furcular hollow and on the belly of this bird. This bird was in the prime of life.
We’ve had soaking rains every day for most of the past week. This weather might have contributed to my failure to notice the waterlogged Swainson’s Thrush I found in the northwest alcove today. It’s not only a sodden mess on the outside, from its state of decay it seems to have spent some time in its unusual location (tucked near the edge of the sidewalk in the muddy grass) before I found it today. I suppose it’s possible to have come in yesterday morning after my check, but I think more likely it came in on May 8 sometime, and I just missed it. I’m confident that it wasn’t there on May 7. Rather than second guess myself I’ll list it as a May 10 casualty unless any of my collaborators have any information to suggest otherwise.
I left the carcass in place for a removal trial.