2,    adults,    anatids,    animals,    autumn,    autumnally,    autumn-time,    aves,    bank,    beating,    beats,    birds,    copulates,    copulating,    copulation,    flapping,    flaps,    format,    lakes,    laterally,    move,    movement,    moves,    outdoors,    outside,    pair,    river,    riverside,    rushes,    Sex,    shores,    splashes,    swimming,    swims,    waterbirds,    waterfowls,    wing,