Yesterday morning my neighbor opened her coop and found a young chick/hen dead. Legs stretched out behind it, in a nesting box. Around dinner time last night she went back to the coop to check on everyone and found a full-grown hen, that was fine earlier, now also dead. She was in the middle of the coop, laying down, head tucked in to her wing. Both had not a single mark on them. This morning she went out to open up the coop and all of her chickens were huddled against a back wall and a head count revealed that another young one was missing. No signs of trauma, and the coop was fully locked up. We cannot figure out what it could be, as there were no signs of the coop being breeched. One of her hens was locked up separately, in the barn, last night and she is the only one acting normal. Hours later, and not one of the chickens will leave the coop . . .they are all in there and unusually quiet, even the rooster. Soon after, I realized that one of my hens was also missing (I have her on surveillance video this morning . . .so she disappeared mid-morning today, while lots of cars were coming and going, the trash truck came by, and lots of people walking in an out of the house, even our dog was in and out during that time). No feather pile. Nothing. And all of my remaining hens are hunkered down and not venturing out either. I believe a hawk killed my rooster last week (I didn't see it happen but came upon the hawk on a post nearby the body of the rooster) but the neighbor still has a rooster. I have a sinking feeling this is all related . . .it seems too much a coincindence for it all to happen at once. But I can't seem to figure out what it could be. My goal is to understand what it is that we are losing chickens to, and then I think I'll work on getting another rooster. Any thoughts? Ideas and suggestions will be greatly appreciated.