In retrospect, he may have had an infection. No way to know without a necropsy.
There is a sticky about suggestions for a ducky medicine chest - among the suggestions is to keep some antibiotics on hand for when they may have infections. I don't recommend using them for any little thing, but sometimes you need them.
Poultry vitamins with electrolytes and probiotics can be used at the first sign of trouble to try to boost the immune system.
With ducks, remember that often they show no symptoms till things are very serious.
There is a sticky about suggestions for a ducky medicine chest - among the suggestions is to keep some antibiotics on hand for when they may have infections. I don't recommend using them for any little thing, but sometimes you need them.
Poultry vitamins with electrolytes and probiotics can be used at the first sign of trouble to try to boost the immune system.
With ducks, remember that often they show no symptoms till things are very serious.