 Located in Cambridge, Maryland, the complex also manages Blackwater National Wildlife Refuge and Susquehanna River National Wildlife Refuge.The tidal marsh, coves, creeks and ridges of the refuge provide an important rest area and winter home for thousands of migratory waterfowl and nesting habitat for a variety of wildlife that change with the seasons.Winter residents on the refuge include black ducks, pintail, mergansers, long-tailed ducks, scoters, bufflehead, Canada geese, and tundra swans.