Eastern Whip-poor-will (Antrostomus vociferus)
Song: Song consists of three loud, clear notes, whip-poor-will, with a quiet introductory cluck audible at close range. It is given at the start of the breeding season, after dark, and repeated rapidly and often.
Eastern Whip-poor-will song, April 24, 2012. Kettle Moraine State Park, South Unit, Waukesha County, Wisconsin.