2,    adults,    anatids,    animals,    autumn,    autumnally,    autumn-time,    aves,    bank,    birds,    canards,    cleaning,    cleans,    drakes,    ducks,    format,    lakes,    laterally,    males,    mallards,    move,    movement,    moves,    outdoors,    outside,    preening,    preens,    river,    riverside,    shores,    size,    swimming,    swims,    vertical,    waterbirds,    waterfowls,