I have a Pekin/Khaki Camble mix baby duck about 3 months old and I noticed it has started walking funny. When I caught him and looked at his foot there was a huge knot on his foot what I would calle the ankle on the duck! As i was feeling of it the duck seemed in pain and it was very hot. I looked to see if there was a spot scratch or anything on it but there wasn't. Anyone have a clue what's wrong with him???