Hello everybody! A few weeks ago, I purchased 2 runner ducklings a fawn and white and what I think is a black (Possibly dark blue) from Cal Ranch Stores here in St George, Utah.... I noticed that the smaller of the 2 (The black one) had a weird tendency to sit on its bottom with its little feet and legs sticking out in front of it like a cute little cartoon... Now, I know this isn't normal, but we have been giving Nutrena flock raiser starter feed and supplementing niacin in their water since the day we got them... Do y'all think it could be a congenital defect? I take him out of the brooder daily for little walks around the yard, but he gets so tired so quickly that he kind of stops walking...does an standing stompy stompy and then just sits on his butt like mentioned above or he just flops and lays on his belly until we pick him up. I've raised Runners before and I've only seen this type of fatigue in my male Muscovy ducks because of how large they get so quickly. Any help or advice would be highly appreciated. Thanks in Advance!