Hey, I let some of my four week old ducklings outside for the first time two days ago, yesterday I noticed some of them were getting splayed legs, their stomachs were in a heap and their legs were sticking out behind them. They’re still very energetic, trying to run around, but can’t because they are unable to stand up, I took a the ones who looked like this and put them under a brooder, in case they had just gotten cold shock, expecting them to be okay in the morning. But when I went out to them this morning they were all still in this state, it’s about ten out of 40ducklings and the other 20 I left inside are all perfect. Is there anything I can do to help them? I’ve never had this happen to my ducks before. They were all taken off chick crumb a week ago and put onto oats, wasting and drinking well still.