2,    adults,    anatids,    animals,    aves,    birds,    canards,    cleaning,    cleans,    Dendrocygninae,    ducks,    format,    lakes,    laterally,    outdoors,    outside,    preening,    preens,    red-billed,    summerly,    summertime,    summery,    tree-ducks,    waterbirds,    waterfowls,