Our 5 month old pekin duck has some sort of wing issue going on. I have searched all over and can't seem to find something similar to what he has. It started about 1.5 weeks ago and has gotten worse the past couple days. He's acting normal and playing/ swimming with the others but occasionally it drops down some. He flaps them normal but jist concerned what may be going on with him. Any insight would be great appreciated. Thanks in advance!