In response to the duck head tilting, I recently started raising muscovies. I hatched out 3 ducklings who were ok until they were 7 weeks old my little Dinky started flopping his head around and walking backwards every time he ate or drank. I thought he was not going to make it. I wasn't going to give up so I started grinding up food in the food processor. I make a mixture of collards, kale, mustard greens, zucchini, carrots, squash, broccoli, and other fresh greens but not spinach. I feed it to all my ducks everyday. After my little Dinky started eating the vegetables he gradually started getting better and after a month he no longer has a problem. He is now a normal duckling. If anyone has a problem like that please make the effort to do this. It is time consuming but my ducks are worth it. They all get the mixture everyday with their duck food. I add watermelon, chard and fish. Tuna is easier. I hope I have helped.