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