We acquired a mallard duckling on the 17th. He/she was stumbling and falling every time he walked. He acts as if he is drunk. My son wanted to save him. We got vitamin/electrolyte supplement and have been mixing it in his water since the 17th. He has made no improvement. If its not a vitamin deficiency, what else could be wrong with him? We got him from a feed store. All of the other ducks he was with were fine. Could his problem be in his brain or could it be a neurology disorder?