4,    adults,    anatids,    animals,    aves,    Babies,    Babys,    bird-nests,    birds,    breeding,    chicks,    cleaning,    cleans,    common,    Cygnets,    duckmeat,    fledglings,    format,    hatchlings,    immatures,    juveniles,    lakes,    laterally,    nests,    outdoors,    outside,    preening,    preens,    river,    swans,    waterbirds,    waterfowls,