I was out yesterday, but when I came home last night I saw my mother and my younger daughter trying to catch one of my Cayuga/Runner ducklings (just bought 5 Blue Cayuga/Runner mixes ranging in age from about 2 weeks old down to a few days old on August 7th). They've all been thriving and they fit in very well with the ducks we already had- 4 Blue Swedish of which 3 of the 4 are drakes, and a pair of Mallards. Along with the Blue Cayuga/Runner mixes I also purchased a Swedish/Harlequin mix baby girl, and a Call duck baby girl. 4 of the 5 Blue Cayuga/Runner mixes are girls. The only boy, Dexter, is the one they were trying to catch yesterday. My daughter noticed yesterday that Dexter wasn't up and moving around with the other ducks, but she didn't think anything of it. She thought he was cold and laying down in the coop to stay warm, so she didn't tell me, but when she went into the coop yesterday and he was in the same place, she was worried, so she went and told my mom who was watching her. When I got home around 5:30 last night they were trying to catch Dexter who had managed to limp out of the coop to get away from them. My DD did catch him pretty easy, and she brought him to me. Dexter was stressed out, so I told the girls to run some warm water in the tub and let him swim to take pressure off the leg for a little bit, which they did. Dexter was very happy to have the water, and I fed him as he swam. I gave him some feed, which he stuck his head under the water to eat, and I gave him some lettuce, which he also ate. I let him swim for a little bit, and then I let the water out of the tub. As the water went out, Dexter laid down on his side with his leg stuck straight out next to him. I took out a towel, gently swaddled him in it, and picked him up. He was not too happy about that, but he calmed down after a minute of being sweet talked. As I held him, I felt his leg to see if there was a break, and I touched both knee joints and the one he's favoring does feel a little swollen. I flexed the leg but he didn't fuss at all, he let me do it for more than a minute. When I laid him back down in the tub I put down a bowl of food, a bowl of water, and I kept him wrapped in the towel. He drank, then he ate, and then I turned out the lights so he could sleep. This morning when I went into the bathroom he was out of his towel and was actually on the other side of the food and water dishes, and he was hissing at me. When I approached the tub and looked down at him I was startled to see that he had pooped-MINT GREEN! He had pooped at least 3 or 4 times overnight, and it was mint green and grayish in color. I've NEVER seen my ducks poop that color before. Up until that moment I had been thinking that maybe he was reaching sexual maturity and one of the Swedish boys had kicked his butt, hurting his leg in the process, but now I'm not so sure. Minty green poop? Dexter refuses to stand up. I don't know what to do, or how to treat him. Has anyone seen this before in a duck? I love my ducks as much as I love my chickens, and I don't want anything to happen to him. Here's some background info in case it's something environmental: I have 15 ducks living with my Bantam chickens. There are 4 Cayuga/Runner girls, 1 Call duck girl, 1 Mallard hen, 1 Swedish/Harlequin girl, and 1 Swedish girl, 1 Cayuga/Runner boy (Dexter), 2 Call drakes, 3 Swedish drakes, and 1 Mallard drake. As for chickens, it's currently a mix of young, not yet laying Standards, and young and adult Bantams. The chickens don't fight with the ducks. If anything it's the ducks that occasionally bully the chickens, but even that isn't that bad. It's more like "get away from MY pool". The two Call drakes are new, only been here about a week and a half, and the Sweidsh drakes challenged them, and the Calls won that fight, surprisingly. Dexter doesn't pick fights with the other drakes. Dexter just got the little curl in his tail, so I think he's reaching sexual maturity, but I don't think he's making attempts to mount the girls yet, and I haven't seen any conflict between him and the Swedish boys. My Mallard drake doesn't challenge anyone, he's a very gentle boy. The chickens and ducks have a sectioned off part of the yard (it's BIG) for them to be in, but they have almost all (ducks included) learned how to escape the fencing so that they can wander the whole yard, and they do like to visit the next door neighbor and eat her weeds and occasionally her cat food. The neighbor doesn't mind, she's even thinking of getting her own chickens and ducks now. My younger DD thinks Dexter may have thrown up the same mint green colored mess. Any ideas of what could be wrong? I hope I gave enough info about Dexter and who he lives with, and where he lives at. Oh, I feed them layer feed, scraps, and bread. The ducks will seriously eat anything I give them. They LOVE oatmeal, rice, soup, cereal, and anything else we think to give them. No complaints from them. If anyone could give me an idea of what to do for Dexter, or how to check better what could be wrong with his leg, or what the oddly colored poop could mean, or am I over thinking this whole thing? Any advice would be greatly appreciated!