Angel Wing

If you feed swans, it is best to give them natural rather than processed foods, Poor nutrition from over-reliance on white bread can lead to conditions such as 'angel wing'in Mute Swans, where the birds' wings become twisted and deformed, or 'pink-feather disease,' where pinkish brown patches develop on the wing-tips.


https://birdwatchireland.ie/app/uploads/2019/03/Species-Focus-Mute-Swan.pdf