In "The Scarlet Ibis," what is the symbolic significance of Doodle's death at the end of the summer?symbolism

Just like the beautiful and exotic Scarlet Ibis, Doodle is unable to survive in the world in which he finds himself.  He is delicate, fragile, and special and is pushed far beyond his abilities by his big brother.  Like the bird, he holds on as much as he can, but in the end is unable to push himself further.