So I bought some baby chicks from our local feed store and about a week later they were all died. When I would leave in the morning they were active - eating, drinking and moving around. When I got home they one would be died, then the next day another one and so on. They would be lying there twitching like they were having a seizure. Does anyone know what this could be? I have had chickens for about a year but this is a first for me.