Well we got our chicks ON morning and they did great for 2 days. Woke up this morning to one dead in brooder and 2 that obviously appear to be dying. All hens. I have kept chicks for many years and not had this happen. The dying ones have tremors and one is exhibiting strange posturing. (In humans we would recognize that as a sign of neurological damage.) I had them vac'd for Marek's for the first time due to my son planning to show them. I also ordered earlier in the spring and so have kept them in our kitchen. Other than that I haven't cared for them any differently than usual. Temp seems right, brooder has been kept clean, fresh food, chick starter. The others look great. Hope I don't lose any more. Ideas?