I was out in the coop feeding watering checking on the flock and came in to get something. I was maybe in the house for 10 minutes. I go back into the coop and 2 of the chicks are dead and 2 more are laying on there sides spinning around with there neck all bent backwards like. Very weird!! One of them had some kind of liquid it looked like kinda dripping out of it's mouth. I picked them up and held them for a long time and then they seemed to be ok. I put them back with momma but they seem to keep leaning to one side and seem very groggy. Any ideas what is going on with this???