Saturday we found a dead hen in the bottom of the hen house. Looked like she just went in and went to sleep. It was crazy hot that day. I assumed it was the heat but now yesterday we went in to find 3 dead hens in the hen house, all side by side. One seemed to have fluid coming from her head (beak / mouth). It wasn't the ridiculous heat that we've had so I'm wondering.... disease??? Poison???? (they do free range about 9 hours a day). They had access to plenty of water and shade. All 4 chickens were only 1 year old - 2 Barred Rocks and 2 Americaunas. Other factors? Well a couple weeks ago I gave them a bag of layer crumbles as their usual diet of scratch grains was out of stock. They didn't care for it. A month ago we had a stray dog attack and kill 2 birds, wounding one of our now surviving birds (she lost mostly tail feathers and is growing them back). One week later a racoon broke into our brooder and killed momma hen and 6 chicks but that was a separate coop that these chickens have no access too. I don't know what other factors there could be but we don't want our last 5 chickens to catch something and die too. The kids are scared to go check now for fear the rest will die soon. I have no idea where to start with this but I'm not thinking it's heat anymore. Ideas Anyone????????????????