My duck (hen) is around 6 months old, has been laying eggs & this morning was disorientated. She has been walking in circles & can't seem to find the rest of the flock. She is not with the flock (she is usually inseperable from the other ducks).
Without knowing more about her symptoms the possibility of botulism occurs to me. It's rare, but my drake was diagnosed with it last year after becoming disoriented and then developing progressive paralysis and vertigo over the next couple of days.
If her condition doesn't improve shortly or begins to deteriorate I would get her to a vet ASAP. If it IS botulism, another toxin or neurological disorder, it's not likely to self-resolve.