I am looking for information. We bought 4 baby Khachi Campbells in April. They have doing very well. Yesterday we started them on some brewers yeast in their food and also for a special treat bought some tiny minnows for them to fish for in their pond. Today we found one of our Drakes dead in the pond. Did we do something wrong? What could have happened. The other drake and females are still doing fine. After finding Superman dead we changed out the water in the pond and added some apple cider vinegar to the water. They were all raised with apple cider vinegar in their water, so thought it might benefit them now. Does anyone have any suggestions or information on what we did or can now do to prevent this from happening again? He was perfectly healthy yesterday. We are so sad, our ducks and chickens are like our babies. Thanks in advance.