I guess I got too complacent. Our only predators have been hawks and obviously they don't attack at night. But something came in from up top of the run ripped it open and got the chickens who like to sleep on top of their coop. There's no entry other than from above but I suppose it could have been something that climbed the side of the run, which is chicken wire, and clawed its way through the top which is plastic bird netting. I even heard something last night like gobbling but I thought it was this night bird near us that I've heard before. I could have saved at least some of them I think. I'm so sad. My 3 year old and I found them this morning and my 2 others will be home from school in a few hours. One seems to be alive and sitting on top of 4 eggs. I don't understand when they would've laid eggs. This is awful.