Thank you for answering! I'm a new "duck mom" so anything that looks a little out of the ordinary sends me down a Google rabbit hole, but the amount of duck rearing information is miniscule compared to what's out there for chickens.
I've noticed some darker spots under my juvenile call ducks wings and now they have developed into these veiny looking strings as his feathers finish growing in. My best guess is that he's moulting old blood feathers, but I can't find anything online that gives a definitive answer. He did start...
