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adults alfalfa American wigeon aquatic invertebrates area closures bance BASIC PLUMAGE behavior BLACK DUCK BLUE-WINGED TEAL breeding bulrush Canada geese CANVASBACK carnivorous cattail dabbling ducks disturbance drawdowns DUCK FEMALE early winter emergent plant emergent vegetation FEMALE MALE NORTHERN Fish and Wildlife ﬂight feathers ﬂightless period ﬂooded emergent ﬂy Food habits food resources forage for molting GADWALL GOLDENEYE goslings green forage habitat requirements Herbivorous hunting seasons increases with body large lakes Large wetlands LEssER SCAUP MALLARD marshes molt chronology molt into basic molting birds Molting ducks molting groups molting waterfowl nesting NORTHERN PINTAIL NORTHERN SHOVELER nutrient Omnivorous open water Open-water portions periphyton permanent wetlands populations portions of large postbreeding molt prebasic molt Rarely observed REDHEAD reduce foraging robust emergent secure from predators security in open Sedges Seeks resting sites shallow areas species begin vegetation ratio water of large water to vegetation Wildlife Leaﬂet 13.4.4 wintering grounds WOOD DUCK