Yes, we have experience with this condition. It may or may not be botulism. It could be any type of toxin that causes the condition where the neck rests on the back.

Usually, not always, but usually, the toxin starts with the neck and then progresses to the rear end. Then, if the birds survive, it seems that the toxins reverse with the back end recovering first and then the front.

There are no guarantees that this will or will not happen in your swan's case, but as long as it is eating and progressing, it does not hurt to wait and see if the condition corrects itself. If by a month, the condition does not correct itself, you may have to consider the quality of life for the swan and make some decisions at that time. The Regal Swan