2,    adults,    anatids,    angry,    animals,    attacking,    attacks,    aves,    beaks,    bills,    birds,    bites,    biting,    canards,    ducks,    females,    format,    lakes,    laterally,    mallards,    open,    outdoors,    outside,    river,    riverside,    sunny,    sunshine,    swans,    swimming,    swims,    threatening,    to,    waterbirds,    waterfowls,