I first want to say thank you to everyone that participates on this website. I've gotten most of my information on duck related questions from these forums. But I have an issue this is not exactly like anything I can find. I have 4 Welsh Harlequin females that are 5 weeks old. About 5 days ago I hear some chirping coming from the birds and one of them was flailing around. Her legs were kicking and her head was flopping back and forth. It seemed uncontrollable because she would knock into the sides of the pen, and knock over water and food dishes. I first thought she was having a seizure so I didnt' touch her. After a couple minutes she started to slow down but her head was still tilted all the way back and flopping back and forth, all the way to the ground on each side of her. After about 10 minutes she would just slow and and eventually snap out of it, stand up, just look around confused for a couple minutes, then go about her normal business. After 2 days of this I started to notice that certain things would set it off. When she would drink some water and tilt her head back to swallow, it would throw her into another one of her episodes. Or when she would tilt her head back to clean, it would throw her into it again. I did as much research I could and found her "seizures" could be nutrient deficiency, virus, bacterial infection, toxins, liver issue, ear infection, or just a phase she will grow out of. So for the past few days, in their water I started a mixture of water, apple cider vinegar, niacin, vitamin E, and an antibiotic (duramycin). In their food I mixed in oregano and brewers yeast. I'd like to start on some activated charcoal too. I then separated her from the other three into a crate near by. Mostly because I had a hunch that the other ducks were setting her off so she was having problems getting rest, but also to help keep her dry. Then we noticed that if we gently hold her head while she started flailing, she snaps right out of it. So she would take a drink of water, almost start flopping, then we would support her head and she would be fine. Which seems like it would not be a seizure. But, 80% of the time she can eat, drink, and clean herself without an issue. She also has a very healthy appetite. It almost seems like she looses her balance and goes into a kind of dizzy spell. I'm leaning towards some kind of ear infection, maybe neck injury? Any one ever hear of this kind of thing before?