I have a male silver Appleyard duck. He has had a limp since he was a duckling, not born with it but it seemed to appear when he was small. Not sure exactly how old he is now, but he has gotten around fairly well for a long time....untill 2 days ago when I let him out of the coop and he was dragging himself along using his wing and beak to drag himself! I put him on a small container in the house so that he can't move around too much. His whole leg is VERY swollen and I am not sure what to do... He does not seem sick he is eating drinking and pooping fine. Please give me any advice you have! I really don't want to have to put him down!