adults,    anatids,    animals,    aves,    birds,    canards,    cloud-free,    Dendrocygninae,    ducks,    flies,    flight,    format,    laterally,    of,    outdoors,    outside,    red-billed,    summerly,    summertime,    summery,    swarms,    tree-ducks,    waterbirds,    waterfowls,