WPAs: America’s Duck Factories
10,000 Birds
MARCH 8, 2017
The potholes and associated grasslands create North America’s most productive habitat for breeding waterfowl, making it an area of global significance for Mallards , Northern Pintails , Blue-winged Teals , Gadwalls , Northern Shovelers , and others. Photos: Prairie Potholes at Kulm WMD in North Dakota (USFWS). million acres.
118 
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