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