Hey guys, One of my ducks, an indian runner named Scout, has started falling. His legs seem to just give out on him and he lays down. No flopping or flipping, he just seems to get tired and lay down in the middle of running or walking or what ever. Sometimes he looks like he tripped and just gave up walking after that. At first I thought it was just a niacin deficiency ( he has angle wing that he developed at his previous owners home) so I started giving him supplemented food and would feed him by himself. I then noticed that he was really under weight. I kept feeding him like that and he put back on some weight(he's still has room for improvement though) and for a while I didn't see the problem any more, now he is at it again. Any clue what might be happening??? None of my other ducks are showing any issues. All fat happy healthy ducks so I don't think it is disease or parasites but then I could be wrong.