Abstract
During duck studies in the Ruthven Area (Clay and Palo Alto counties) of northwest Iowa, information was gathered on the nesting of other marsh birds. The observations were made from March to June, 1942, mostly on three State-owned preserves: (1) Dewey Pasture, a 402-acre tract of upland blue-grass pasture with 38 small kettleholes and enclosing some shoreline of Mud Lake, (2) East Mud Lake Slough, a 98-acre marsh, and (3) the Outlet of Lost Island Lake, a 1000-acre marsh.
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