How did doodle get his nickname from scarlet ibis?

Doodle received his nickname from the scarlet ibis, a bird that appears in the story as a symbol of beauty and fragility. The bird, which is vibrant and unique yet ultimately succumbs to its environment, parallels Doodle's own delicate nature and struggles. When a scarlet ibis falls and dies in the family's yard, it prompts the narrator to reflect on Doodle's own vulnerability, leading him to affectionately call his brother "Doodle." This nickname encapsulates both Doodle's physical limitations and the deep bond between the brothers.