Wings are formed within the Haibane's body, first appearing as uncomfortable lumps on the back. Within a day or two of the hatching, these grow rapidly and put the Haibane into a state of fever, finally bursting through the skin in a painful and bloody manner. The pain and fever last for about a day before rapidly and completely subsiding. Meanwhile, the feathers of the wings must be cleaned, or else the blood and other fluids will stain them. Thorough cleaning can be a long procedure and must be done by someone else, as the newly born Haibane is too weak and in too much pain. Once Haibane recover their health after this ordeal, they start to be able to move the wings, although it takes some time to gain complete control over them. After a week or more of involuntary twitching and quick exhaustion, each Haibane finally learns to control the wings like any other part of their body.