I have 14 ducks and one of my male Pekins is not well. I have had him for 3 years and not sure how long he was here before we took over. He is eating and I have seen him in the pond but very infrequently. He acts so very tired and sleeps a lot. He had an injured leg a few weeks ago and I confined him for ten days. He is now walking OK but still a little gimpy, but he has always been a little gimpy. He stays huddle on the grass while the others pick bogs and so forth. Any ideas?