Tim's been sorting specimens at the AU museum and I stopped in for a couple hours today to look at some of the skins. They had one each of the four longspurs, all essentially breeding males.
You can see the difference in primary projection for the long distance migrant Smith's and Lapland as opposed to the two prairie birds. The Chestnut-collared is faced somewhat away from the camera, but the smaller bill was apparent.
Here's the two waterthrushes, Northern on the top and Louisiana on the bottom.
This next shot shows a point I wasn't aware of until Tim pointed it out this spring:
Northern has some speckling on the throat while Louisiana has a much cleaner throat. The speckling on a Northern's throat is hard to see in the field though, the presence of the marks is more reliable than the absence of visible marks on most views.
The last shot shows the flanks:
The last shot shows the flanks:
I've got photos enough for a couple more ID themed blogs, so hopefully this site will be more active than it's been of late...
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