tags: American Pipit, Anthus rubescens, birds, mystery bird, bird ID quiz
[Mystery bird] American Pipit, Anthus rubescens, photographed in Minnehaha County, near Wall lake, South Dakota. [I will identify this bird for you tomorrow]
Image: Terry Sohl, 10 November 2008 [larger view]
Photo taken with a Canon 40D, 400 5.6L.
Please name at least one field mark that supports your identification.

Basic-plumaged American Pipit (Anthus rubescens), based on slender bill, dark cheek with white eye-ring and supercilium, and streaky underparts. Sprague's Pipit (probably the next most likely pipit in the northern plains) would have a paler cheek (making the dark eye much more prominent), and less streaking on the underparts.
I so want Grrl to Albatrossity's 'underparts' to 'underpants'.
You're a strange man, Bob.
Keep up the good work!