Unfortunately, she died. I have two more khaki campbells acting oddly with their heads shaking and them not wanting to walk very much. I fear that they will die soon. I have been feeding them purina flock raiser, so shouldn't they be getting enough niacin? I added nutritional yeast to their water today in hopes that the deficit is what is causing this behavior, and it will be corrected, but I am a little worried to be honest. I don't really understand it. I have them in a brooder with plenty of water and food. The temperature is adequate. Maybe it's a little too warm right now, but I have little chicks in with them as well, and they are making no effort to move away from the lamp leading me to believe that they are not too warm. (However, these ducklings are only about 4-5 days old now.) I had an ancona duckling die because of this behavior earlier, that's why I'm so worried. I found her at the same time as the khaki campbell. So, just a little frustrated. We only have the two khakis left. I have ordered ducks to come in and I have more duck eggs incubating, but I just don't understand what I have done wrong for them to die.