I have 2 Rouen ducklings that were doing great until recently. 1, which I believe is a male seems completely healthy, growing well, happy, drinks and eats plenty, etc. The other, which I believe is a female, has recently started losing the down on the top of her head. This was the only symptom until this morning. I noticed that she has suddenly stopped eating and drinking, she also only walks very short distances and is pretty slow and wobbly. I have no idea what to do and we are snowed in. I am planning to add a bit of Apple Cider Vinegar to their water, but she's not drinking so I don't know that that would do much of anything for her. I have a syringe that I can give her water through. ANY advice would be greatly appreciated, google is of no help to me right now.