It's hard to find info on ducks so I wanted to share. I have an older duck that hadn't eaten in at least 5 days. She was drinking water. She wasn't interested in her treats, peas, mealworms, or scratch grains or their pellets. No vets around here know much about ducks and I thought she was on her way out. As a last resort I got some electrolytes and probiotics at the feed store, marketed towards chick's. Within a day I noticed her showing a slight interest in food. By the 2nd day, she seemed to be eating her treats normally and feeling much better. Ducks are picky but they seemed to like the electroyte/probiotic mixture. I would recommend trying this for ducks with similar symptoms.