We had our first predator attack since moving here. My chickens are free to roam our land during the day. Today I found two 2 month olds dead in the run, right close to the coop, one only had it's head gone, the other had it's head gone and wings detached. I have a silkie completely missing without a trace. I also have some feathers that look like came from one of my ISA Brown 4 month olds. Those feathers were outside the run about 20 yards away from the dead chicks. I don't think I'm missing any ISA browns, but one has a little drop of blood on the top of her head, maybe she got away for whatever tried to get her. We are in northern Indiana. Any ideas what I'm dealing with?