Hmmm, we did have a number of feral cats several months ago when the ducks were only a few weeks old. We managed to get rid of most or all of them. We haven't seen a cat in a while.
It's been a couple of weeks since I placed their feeders on a concrete pad. This is far more sanitary than damp ground and I have not seen any mold issues since.
Unfortunately, the problem persists. I now have another 3 ducks exhibiting the same symptoms.
I've been following some of them...
You may be on to something here with the mold. The ducks scatter some of the feed on the ground around the feeder, and I have seen this feed mold in the dirt immediately following wet weather.
I've also noticed that when the feeder is empty or near so, some of the ducks will scoop up the fresh...
We have 4 different ducks (9 months old) that will suddenly have trouble standing. First they lean back just a little, then fall forward and catch themselves with outstretched wings. Then they sit down and won't move. In about 4 or 5 minutes they will get up and walk away as if nothing was...