2,    adults,    anatids,    animals,    autumn,    autumnally,    autumn-time,    aves,    bicolor,    bicolour,    black-white,    canards,    copulates,    copulating,    copulation,    drakes,    ducks,    foggy,    format,    lakes,    laterally,    males,    move,    movement,    moves,    outdoors,    outside,    pair,    Sex,    swimming,    swims,    two-colored,    two-coloured,    waterbirds,    waterfowls,