This will be long and detailed so I apologize in advance... All of my ducks are rescues and came to me in not so great condition. I've had most of them for a year now and they have all appeared healthy and happy. We took in a few chickens the neighbor girl had rescued that she could no longer keep about two weeks ago and I had put some Oxine AH in all the waterers for a few days, which I've done before with no ill effects. I then switched to organic ACV for about a week. About a week ago one of my young drakes appeared ill for a few days (sleeping a lot, just generally not interacting and chasing bugs like usual). I gave him some supportive care (acv water and chick starter mash) and within two days he perked up and was back to his usual self. Then my drake Blue, who was an adult when I got him and therefore I don't know his age, began acting the same way. At this point I was watching my whole flock very closely for any small signs of illness. I gave Blue the same supportive care but overnight he became very ill and disoriented, wanting to throw his head back, and he passed away Monday afternoon. The shocking thing was I found my Momma duck, who was 10 days into sitting on a nest of chicken eggs, laying on her back about a foot away from her nest having passed away that same afternoon. I had peeked in on her that morning and she was acting normal, even hissing at me for getting too close to her nest. I also saw her come out to eat and drink like usual and then race back to her nest. There were no obvious signs as to why she would have died. So that afternoon I disposed of both bodies and proceeded to clean, scrub, and disinfect all the waterers and dishes, the coop, and everything they come in contact with regularly with diluted Oxine AH. Two days ago my white drake had pus coming out of his eye but otherwise appeared fine. I rinsed it out with a Tylan/saline wash and put terramycin in it. They eye appears much better but he is still sitting around and not interacting a lot. I've been spending about three hours a day with everyone and observing behavior and other than Ghost everything has been normal. Well this morning I open up the coop to find one of my white female scovies had passed away just inside the coop door. It looks like she entered the coop, laid down and died. She was running around eating and chasing bugs just last evening! I just don't know what to do. Ghost is still sitting around but his eye looks good, should I separate him from the flock? The only change is that everyone has just started their fall molt. I was thinking of disinfecting everything again and treating them with oxytetracycline in their waterers. I spot clean the coop daily and spray oxine AH about twice a week but I will be doing a full cleanout and disinfection tonight. The chickens have all been fine so I don't think it has anything to do with the adopted chickens. My chickens all have MG anyway and so did the neighbors because they were rescued from the same place (also where the ducks came from) so none of that is new to any of them. The ducks eat chicken feed, dry cat food about twice a week, cracked corn, scratch grains, fresh lettuce and vegetables, and occasional treats include bird seed and wet cat food. They also get weeds from the garden and grass clippings which are mulched. They've also been eating a lot of leaves from the trees since they just started falling. The only other thing I can think of would be possible poisoning? The previous landowners used the whole place as a burn pit and I spent years cleaning up and sifting through the dirt collecting parts of toys, bullet casings, batteries, pieces of glass etc. I *thought* I had sifted through everything and got it all where the run is but the chickens scratch up new things occasionally that shouldn't be in the ground. I walked around daily and pick up any little thing that I see. Unfortunately I have found a screw driver bit in a waterer and also a piece of glass about two inches by one inch long in the past three weeks. Maybe the ducks are finding and eating something they shouldn't be? I can't really move the run, we just spent a lot of money putting it all up! Does this sound like an illness (like duck viral enteritis- which I am hoping and praying it is not) them eating something they shouldn't? Time to invest in a metal detector? Any advice would be greatly appreciated because I am at a loss and I don't want to lose any more ducks. Thank you for reading this!