2,    adults,    anatids,    animals,    attacking,    attacks,    aves,    beating,    beats,    birds,    bites,    biting,    copulates,    copulating,    copulation,    flapping,    flaps,    format,    lakes,    laterally,    move,    movement,    moves,    outdoors,    outside,    pair,    river,    Sex,    swimming,    swims,    waterbirds,    waterfowls,    wing,