4,    adults,    animals,    aves,    Babies,    Babys,    beating,    beats,    bird-nests,    birds,    breeding,    broods,    chicks,    flapping,    flaps,    fledglings,    format,    hatchlings,    immatures,    juveniles,    laterally,    nestles,    nests,    outdoors,    outside,    seabirds,    size,    stones,    vertical,    waterbirds,    waterfowls,    wing,