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Needed some help from some MD birders to ID this one. 3 or 4 folks responded back that it was a Wilson's Snipe. Also found some good matches at the Cornell Library of Sound:

http://www.animalbehaviorarchive.org/loginPublic.do.

martinap2@verizon.net

Wilson's Snipe recorded on 4-11-08 at 1:32 AM