Last night when my son was putting the ducks to bed he mentioned one of my runners was having trouble walking and he picked her up and put her in the barn. He said another one was as well, but I didn't think much of it because they will limp around for a day or so and then be fine. It's usually due to our drake. This morning when he let them out I asked how the duck in question was doing and he said she had died! I went out and noticed my male and 2 of my other females are having trouble walking. They will take some steps and then fall to the ground with their wings spread out. They are able to get around and are still hunting around for food and drinking water, but i'm wondering if we have a parasite going around. Does this sound familiar? We've had ducks for several years now and I haven't ran across anything like this yet. We did take in some chickens for the neighbors this summer, but they are housed separately. One of the chickens randomly died a week or two ago, and was kept in a separate area from the ducks, but everything i've ever read doesn't link a lot of chicken diseases to ducks, so i'm feeling like this is unrelated. Our ducks are in a new section of the property that they haven't been on since last winter, so i'm also wondering if they ate something they shouldn't. I was going to run to the store for some poultry vitamins, but hoping this sounds familiar to someone and they can guide me on treatments to try.