Oh gosh! eek! If that's it I am glad the source may have been found. I am not sure if there is any intervention can be done. I hope this bumps your post up so maybe someone spots it.I just found a patch of what I believe may be ground ivy (looks kind of like cat nip, but its not) in the pen that the ducks were in when this first started. if some of the ducks ate ground ivy could they still be showing signs and dying days later. And is there anything I can give them if they did eat it at this point. It was behind the shelter under some trees I don't know how I missed it during construction of the run and shelter, or during all those walk throughs I did before letting them out and after they got sick. If this is what did it I feel awful.