One of my three week old pekin ducks has developed a leg problem in which the ankle joint seems deformed. It causes the leg to turn in/under so when the duck walks he's kind of walking on the outside/top of his foot. I don't believe that he could have been injured, as he's still in the brooder with everyone else. Could this be a hereditary defect, or a dietary deficiency? Nobody else has any problems. He seems to be able to move around ok in the brooder, but I'm not confident that this will be the case once moved to the big coop and/or outside. Has anyone had leg problems with ducks?