I have a smaller Pekin duck that appeared drunk and unable to walk properly, I isolated her and began treating her for botulism as that was the most likely cause of the problem after some internet research. She is eating and drinking but still is not walking when I set her down to walk but when she is in the tub she does move her legs and stays upright. The local vet suggested it may be vitamin d issue but the symptoms do not seem to match. Any thoughts?