I have 6 KC ducks about 11 weeks old now. One I named wobbles has walked funny since I git them. He (newly developed raspy voice) can only walk a short distance then sits. My other ducks are pretty skittish but he seems to know I will carry him when he needs it. His knees seem to be stiff. I think it might be congenital and permanent because it has been since he was tiny. All the other ducks are fene just wondering if there is any known disorders?