Yesterday I notice my 11 month old Pekin not wanting to walk, and laying down after a few steps. Had nothing but clear watery dropping. I immediately took her to the avian vet since this was first time I have had a sick duck. The vet was not helpful, had no advice for me, and told me to take her home and watch her. Did a stool sample which was negative for parasites. I have been giving her probiotic and electrolytes. She will eat a little food, but still gobbles down lettuce and peas. When I help her to stand she is wobbly, flails her wings and drops back into sitting position. She seems to "tuck her tail" when trying to stand. Have put her in the warm bath, and she used her legs fine. Does not prune after though. No egg for several days, nothing is stuck from what I can tell. Her droppings are now green, but of course what I have been feeding her is green. I have read through other threads, and hoping I'm doing everything I can. I have 2 other ducks, and they are both fine. The one that is sick, is my largest. I was thinking it was possibly a niacin issue. Any suggestions would be much appreciated.