Quackmore is a one-year-old Khaki Campbell drake. He lives with another KC drake, 6 KC hen ducks, and 2 Pekin hen ducks. They also share the yard with and sometimes interact with 9 Runner ducks, (2 drakes & 7 hens). The drakes are always busy chasing the hen ducks around for mating, and sometimes clash with each other over one duck's attentions. The other night when we were putting everyduck in their houses for the night we noticed that Quackmore had a severe limp. He can't place his left foot on the ground, but hobbles around by just dotting the foot on the ground for balance. I examined the foot & leg and saw no injury or swelling. All the parts of his leg seem to bend as they should. And wow, he sure can get around FAST despite his problem. I put him in the pool and it seemed like he was able to use it to swim, but it was dark and difficult to see how much he was using his affected left leg. I tried to put a little liquid baby vitamin down his throat, he wasn't too pleased with that. He's been staying confined to the pen with just one other duck hen for company since yesterday. He is willing to go around with his flock, hobbling fast when they move around, and is awfully hard to catch. Yesterday morning I let him out of the pen to see what he would do and we had a really difficult time catching him to put him back. But I couldn't leave him in the yard, the 3 other drakes were taking turns mating with him! I guess it's just their way of asserting their authority over him, making him submit to them. But I don't think he needs that hassle. I hope it will help to keep him confined so that he can rest his injured leg as much as possible. He and his hen duck du jour seem content together in the pen with their little pool there. Please, what else can I do to help him? I tried to search "slipped tendon" but couldn't find a definite answer. Do you think that could be Quackmore's problem? How could I determine if that's the problem, how to I treat him? He and I thank you for your input!