It is sunrise in central North Dakota, near Chase Lake National Wildlife Refuge. We are next to a prairie pothole marsh, edged with cattails and rushes. The marsh is alive with sounds. We hear the reedy songs of Marsh Wrens, the hollow onk-ka-chunks of an American Bittern, the whinny-like outbursts of Sora rails, the conk-la-rees of Red-winged Blackbirds, ducks calling and splashing, the loud wheets of a Black-necked Stilt, and the repeated musical notes of a Willet, circling overhead.