Actions Bay Bird Brackish Chesapeake Duck Estuary Fowl Gender /Race Maryland Swim Water Waterfowl Wildlife Winter america anatidae animals anseriformes atlantic aythya valisineria beak birds body canvasback canvasbacks choptank coastal cold color colour dive diving drake ducks eastern edge environmental estuary eye eyes feathered feed feeding flock flyway fowl frenzy frigid full gregarious group habitat horizontal interacting male many migrate migrating natural nature north numbers/ fractions ornithology outdoors portrait protected river shoreline species swimming tawny temperature tide together togetherness various watch watch watches watching waters waves wild winged