In all my life of having chickens, I’ve never seen this. Anybody have an idea? In my secure chick barn this morning (newer 20’ sea can with upper ventilation- no way for predators to get in) I found about 20-30 chicks dead. These were 10 days old. Many were out of their pen, some strewn on the floor, many stuffed in books and crannies dead, like they were terrified and hiding. There were 12 survivors still in their pen, under their heat plate. Seemed fine but scared. In another pen were some 5 week olds- all fine. One was out and seemed dazed, a couple of the small ones were somehow in their pen, dead. This looked like a massacre / attack. Yet not a drop of blood was seen. Not a single injury noted. All looked like they died at the same time- last night. All were fine at last check yesterday evening. Today all the survivors seem fine. No signs of illness at all. Craziest thing. I’ve searched the entire building & there is no sign of a predator anywhere, or droppings, tracks, or signs anything could have possibly gotten in. This is a sea can insulated, with windows & lined with plywood. It’s like a bomb went off and they all died of fright. WTF...?!?!