To answer some questions raised and not get in a big hassle about the causes...OOPS I see Duck Keeper has already posted a good site. So minor answers.
Vet Wrap seems to work best for taping the wings, it sticks to itself only, not to feathers or hair.
It needs to be treated early or the wing joints are deformed and the condition is untreatable.
If you watch carefully you see that the birds are not folding their wings properly, the wing tips that should be laying on the ducks back are sticking out at an angle. Make sure you have folded the wing properly before you tape.
If you waited too long or the taping didn't work the next best thing is to clip the feathers sticking out so they don't get hung up by them or present handy places for other birds to pick at.
