I had my son feed the chickens yesterday and everything seemed fine. Today I sent him out again and he came running back in and told me "fire up the grill, it looks like we have a dead chicken!" (he was really shaken and he was trying to make a joke to keep from crying... bless his heart.) Anyways I went out and sure enough one of my year old hens was dead in the coop. She was just on the floor near the door. I'm not sure if she's been laying or not since I had 7 hens and I cant tell who's been laying which eggs. The free range and none have acted weird. Everyone was eating and drinking normally saturday pm when I was out watching the chickens.... no signs of thrashing, stress or blood. She was laying down when she died because her feet were tucked up underneath her. What are the possibilities here? I'm scared all my chickens are going to die. Any help would be appreciated.