One of my young call ducks keeps backing up like he doesn't have control over where he goes. He also shakes his wings and his belly is wet (I don't think he was in the water recently but he could have been). He is able to stand and flap his wings when he wants to but then backs right into the corner again. I put nutra drench in his water a few minutes ago for extra vitamins, any other suggestions that I can do for him or why he is doing it? He's eating a wild game food that has niacin added to in, does he possibly need more? Thanks.