What does the color red in 'The Scarlet Ibis' symbolize?

Death, because red is the color of blood. Doodle's body is red when he is born. The tree outside the house is called 'the bleeding tree.' The ibis which dies is red and after the ibis dies, Aunt Nicey comments that a red bird dying is a bad omen. Brother runs back to find Doodle in the storm and sees him under a red bush where he died. When Brother first sees Doodle he sees blood on his shirt. Virtually every reference to something which is red points to Doodle's death.