I came home to find 10 of the 11 hens I've had for a year dead. I don't know how the one hen survived...she is one of the first chickens I've owned. I have an electric fence, and within the electric fence I have a dog kennel with a secure top and bottom attached to the coop. I never let the chickens free range, but they do have access to hang out inside the electric fence, but when I go to work I keep them secure in the kennel. Well...not today. I wasn't going to be gone that long...and now I have one freaked out hen. 3 hens were dead inside the fence with what looked like a puncture wound to their backs, their heads intact...the other 7 I can't find anywhere. There is a lot of feathers heading towards the woods, but I can't find one trace of any bird. The fence was peeled back slightly from the opening, not knocked down. I wonder what killed my chickens? This is the hard part of raising chickens.....awful.