Duck dying - Page 2
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How are the others? If this has been going on for several days, he could have eaten something toxic. Coins, paint chips, mushrooms...
There are so many things that can happen. He could have had a systemic infection and hidden it from you till it was far advanced. He could have had a mild virus, but got run down, and had a stroke.
Often it is not. Just keep a close eye on them - you may want to change out bedding, scrub food and water pans, that kind of thing just to be on the safe side.
You may also consider sending a fecal sample to a vet for testing - it usually doesn't cost very much just for the sample to be tested.
- Plum Nearly Farm