29 May 2018 – Brown Thrasher

Found just the second ever Brown Thrasher as a window-kill victim at the Noble Research Center on the OSU campus in Stillwater. This was an AHY female with a well-defined brood patch, no fat, and no obvious collision injury on the bill.

Six-month summary: July–December 2010

Here is just a quick summary of casualties at the Noble Research Center from July through December 2010:

Very fat Mourning Warbler that never made it to the wintering grounds.

I detected 25 individuals of at least 16 species among the casualties. The complete list:

grasshopper sparrow – 4
ruby-throated hummingbird – 2
mourning warbler – 2
song sparrow – 2
Lincoln’s sparrow – 2
unidentified passerine (1 warbler, 1 sparrow) – 2
black-and-white warbler – 1
Carolina wren – 1
mourning dove (juv) – 1
least flycatcher – 1
common yellowthroat – 1
black-throated green warbler – 1
brown thrasher – 1
house wren – 1
red-breasted nuthatch – 1
white-throated sparrow – 1
field sparrow – 1

Because I was able to get to the NRC earlier each day during autumn than practical in 2009, I encountered more individuals that were stunned and “trapped” by the building for some time period without obvious mortal injury. Most of these birds are presumed to have eventually moved on, but it is quite likely that the house wren and one of the Lincoln’s sparrows on the “stunned” list were unsuccessful in their respective bids to escape from the confusion of the NRC, and are listed above. The bat represents the first mammalian “capture” by the NRC:

Lincoln’s sparrow – 5 (4 in one flock)
house wren – 1
common yellowthroat – 1
Nashville warbler – 1
grasshopper sparrow – 1
dark-eyed junco – 1

It’s dark when migrants like this Lincoln’s sparrow drop out of the sky and try to find a good spot in which to rest for the day. I’m beginning to think that most collisions are occurring in that last hour before sunrise.

September 2010 summary

It looks like Sep. 1 is the only day I did not check for casualties this month. Here’s what I found on the days I did check:

2 Mourning Warblers
1 unidentified warbler
1 Least Flycatcher
1 Common Yellowthroat
1 Black-throated Green Warbler
1 Ruby-throated Hummingbird
1 Brown Thrasher

25 September 2010 – Brown Thrasher

The Brown Thrasher is one of the most common and conspicuous migrants here in central Oklahoma, so I suppose it was inevitable to find one at the NRC some day. The bright yellow iris reveals this bird to be an adult (AHY). It was still warm when I found it.

I scored the fat on this bird a “1”, so it was a migrant (they breed here somewhat sparingly). What I don’t know is if this is one of our local breeders making its way south, or a bird from say, Alberta, passing through. It’s sad either way.

Hummingbird and cuckoo still in evidence.