Our 5 week old gosling has started to flip over and have what appears to be a sizure. This was just 2 nights ago. She has continued to have these episodes and this morning it looks like she is paralyzed on one side. The other 4 goslings are doing fine. This one is smaller than the others but was developing just fine. Could this be a minerial defic such as "crooked neck" in chickens? I believe it is eating duck food but it is out grass and also getting bugs and grit. Anybody also have this problem? We are worried sick. She is the favorite.