We just hatched 22 chicks - all healthy - this past Sun. & Mon. a.m. We put them in our home made brooder (which we've used successfully MANY times before) and all has been well for the yesterday & today. At 5:00 my husband looked at them and they were all doing fine. By 8:00 this evening, every last one of them has died or is in the process of dying now. We are totally baffled. They haven't been wet, cold, hot, etc. They've had all eaten food and drank water. This is a first for us... usually we might have one or two that don't make it, but we've never had the whole flock die in a matter of about 2 hours. Does anyone have any idea what could cause this???