2,    4,    adults,    anatids,    animals,    aves,    bank,    beating,    beats,    birds,    canards,    common,    contact,    drakes,    ducks,    flapping,    format,    gulls,    lakes,    laterally,    males,    mallards,    outdoors,    outside,    river,    riverside,    seagulls,    shorebirds,    shores,    swimming,    swims,    waterbirds,    waterfowls,    wing,    wingspans,