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.

October 2010 Summary

I checked for casualties on 25/31 days in October, and encountered the following:

1 unknown songbird
1 House Wren
2 Lincoln’s Sparrow
2 Grasshopper Sparrow
1 Red-breasted Nuthatch
1 White-throated Sparrow
1 Song Sparrow

26 October 2010 – Grasshopper Sparrow and Red-breated Nuthatch

The nuthatch (female, apparent AHY) had already been hit by ants about the head, so I left her in place to check on scavenging rate. This is the 2nd nuthatch I’ve found in the past week or so (but the first I’ve recorded at the Noble Research Center), and it might portend a big influx this winter. Check out the winter range of this species:

The sparrow (AHY-U, fat = 3) was another beautiful, fat, healthy victim of its own sensory perception being unable to detect a barrier of glass.