We have a two(ish)-month old duck that came up lame over the weekend. We got home Sunday and he was fine then that night I noticed he was limping. He is still eating and drinking and attempting to move about but tries to use his growing wings and tail to keep himself balanced. He also still attempts to get away from me when I'm down there as well. Then, yesterday morning I noticed the leg was very inflamed/swollen compared to the other and his hock/hip appears to be as well. I'm not sure what happened because they've got pine shavings in the plastic tub they are in and they're changed out every two days. I hadn't out niacin in their water so I did yesterday afternoon. He appears a little better but not much. Any advice on what to do?? I've contacted my vet as well as another that I was referred to and no one seems to have any knowledge on ducks....the duck is pictured below. We aren't even sure what type he/she is since we bought them from a farm store.