3,    adults,    animals,    aves,    Babies,    Babys,    beaks,    bills,    bird-nests,    birds,    breeding,    chicks,    eat,    eats,    feeds,    fledglings,    fodder,    format,    hatchlings,    Highlight,    immatures,    juveniles,    laterally,    nests,    open,    outdoors,    outside,    Passeri,    size,    song,    songbirds,    swallows,    vertical,