We have a flock of about 40 birds most quite young. We have 2 crested black ducks, 1 crested peking, 3 runner ducks, 4 call ducks, one goose, 4 muscovy ducks and about 25 chickens. The ducks we all born at the beginning of June so they are close to 6 months old, the chickens are about three months old and the goose is of an unknown age since we got him as a rescue. Our black crested female has been looking poorly of late. Her crest has been thinning and her walk has been more strained. Today she couldn't keep her balance at all and she keeps falling over, sometimes flopping around and craning her neck, unable to right herself. I separated her from the rest of the flock and I've just put her in our side yard by herself. I can't seem to find any information about what's could be going on with her. There are several threads out there on crested ducks loosing their balance, but we're feeding un-medicated organic flock raiser feed, this duck is mature, we give lots of supplemental feed in the form of scraps from a local restaurant. Just not sure what to do other than sit back and wait. Here's our poor little girl having a rough day.