13 June 2016 – Field Sparrow

I found a second-year female Field Sparrow at the main north entrance this morning.

Screen Shot 2016-06-13 at 8.38.18 AM

This female too, had a well developed brood patch.  She also had some fat laid down; I’d say coded a 2. Here again, it looks like we’ve got post-breeding dispersal on display.

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.

2 November 2010 – Field and Grasshopper sparrows

NOTE: I did check on Nov. 1, but neglected to make an entry: no casualties.

I heard several flight calls while walking home from a basketball game around 9:45 last night, so I thought there might be a bird or two around the NRC this morning. There was.

First, I flushed a Grasshopper Sparrow from the hedges on the north side. Eventually, I herded this bird away from the building but he bumped into windows several times while trying to get his bearings. There was also a plump male Dark-eyed Junco similarly trapped by the building this morning, and I tried to herd him away as well. Time will tell if I was successful.

Another Grasshopper Sparrow was not so lucky. I found that bird in good condition but for some ant damage on the face, so I imagine that it came in some time yesterday. Either I missed it on yesterday’s search or it came in during the day. I left the sparrow in place to get some more scavenging rate data.

The second victim was this Field Sparrow, the first of this species I’ve found in window collision monitoring:
(AHY, Fat = 1)