Hello! I would like to say first off that any help or advice is appreciated. I have been raising chickens for the better part of a decade, but this has never happened to me! It started with the keets, then the chicks, then the ducklings (still alive right now). Here are the symptoms: They are fine, eating one minute playing, with the ducks they were actually outside grazing. Then they start simply flopping, as if they have no control of their legs. The seem to lose the nerves in their legs. I feed the chicks medicated chick starter, the keets game bird starter, and the ducks, ducklings starter with greens. I was too late for the keets and chick, but I islolated the ducklings, gave them fresh bedding, food, and water. Any advice for further steps and precautions? And does it sound like Mareks disease to any one?