I have 7 or 8 ducks (can't remember, would have to go count), and one of the two drakes has a droopy wing. He's about 9 months old, just one wing is droopy. He's also a bit lethargic. He still follows the flock out to free-range, just doesn't follow as quickly. He eats, just not with as much excitement. No feather loss, no changes in diet, and none of the other ducks are sick. We did lose another drake right before Thanksgiving, but the symptoms were different. That one couldn't walk at all, and appeared like he had a neck injury. He also still are and drank, was still very alert, just couldn't walk. Any ideas? He's not gotten any better or worse since I noticed this a few days ago, and he doesn't appear to have lost weight. I've not noticed any unusual poop or anything.