So we got four ducklings from our local Country Max on Friday. I left for work on Saturday afternoon all were fine fresh water food and bedding. I got home and checked on them because I've read that they need fresh water multiple times a day. I noticed one of them was not using him right leg I checked it for a break didn't see one but they're so small I wasn't sure. It was after 11 pm so I called my sister we decided to wait til the morning as it was still eating, drinking , and getting around ok. The other ones weren't bullying him. On Sunday we decided to take the limping duckling out of the main cage we out him in a different cage with a stuffed animal and his own food and water. At this point he isn't using either of his legs but he still has feeling in them bc when I touch them he can move them. And he scooches around but not using his legs. We made a vet appointment for today and the vet said I was right they aren't broken he has a neurological problem, but does not go in to detail about how it is caused. He said he most likely will die bc it has effected both sides in such a short time, Unfortunately he was right he passed tonight. However it gets more complicated! While my husband was upstairs he checked on the others they were running around and all of a sudden the other Rouen duck stopped seized and died! What is going on! That one had shown no signs of anything wrong with it. We now have 2 runners that came from the same place as those two are those ones at risk? I cleaned everything in the cage before I put the other 2 back in the cage. someone told me the heat light could of fried their brain is that true?! How do I know if its to hot and my husband was in the middle of changing the water when the one died could it of choked? I'm desperate for some answers.What causes neuro problems? Can anyone out there help me please?? I need some peace of mind that I'm not a baby duck killer!