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Angel wing is a physiological or perhaps better to say developmental disorder of the wing tip, the outer segment, that happens when the primary feathers start to grow in at around 4 to 5 weeks. The feathers become too heavy for the underlying bone and/or tendons to support it, and the wing tip droops and turns outward at a funny angle.
If untreated, the wing becomes permanently set at the weird position, rendering the bird completely flightless and also cosmetically undesirable. It generally does not impact quality of life. Because it MIGHT have a genetic component, probably better NOT to breed these birds.
It also MIGHT have a nutritional component. It may be linked to a high protein diet, and/or a lack of green plant matter or carbohydrates (grain).
No one is really sure.
The treatment is pretty straight forward -- as soon as the wing tips are seen twisting, the wings should be bound into the normal position with medical tape or similar.
I just corrected this on my Pilgrim ganderling. It was easy to do in the sense that he is extremely tame, but I had problems the first week, was trying to use the medical tape that sticks to itself and not the feathers, and it just would NOT stay on. Finally in frustration and feeling that time to correct it was growing short, I used duct tape. Had to cut it off, but wasn't as bad as I feared, and it worked -- today, he was untapped since yesterday, and the wings are PERFECT!