4,    adults,    anatids,    animals,    aves,    birds,    canards,    catnapping,    catnaps,    cleaning,    cleans,    doze,    dozes,    dozing,    drakes,    ducks,    females,    format,    lakes,    laterally,    males,    mallards,    outdoors,    outside,    preening,    preens,    resting,    rests,    river,    size,    sleep,    sleeps,    snoozes,    snoozing,    vertical,    waterbirds,    waterfowls,    winterly,    wintertime,