Anyone who knows the meaning of the song Flightless bird, american mouth?

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Hi everyone, do you know the song "Flightless bird, American Song"? the wedding song of Edward and Bella in Breaking Dawn and it was also the song played in twilight during the prom. I ,really really love the song it makes me cry everytime I hear it but the problem is, i cannot exactly interpret the lyrics of the song. i'm not even sure if its actually a love song, when i read the lyrics its like its more about ones self, i'm not sure its just its not like a love song.