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This big diving duck, the largest of its genus, is wary and swift in flight, earning the respect of sportsmen. It is a characteristic bird of prairie marshes in summer and saltwater bays in winter. The Canvasback dives for its food, mainly the bases and roots of plants growing underwater. Its species name 'valisineria' refers to the technical name of wild celery, an aquatic plant that is among its favored foods.