Some of our chickens have been sleeping in a doug fir tree. Last night we heard a commotion and ran out to find one chicken dead on the ground, with no marks on her, just 4 missing tail feathers which were on the ground under the tree. The rest of the chickens huddled under a bush near the base of the pine tree. We have electric wire fencing. I saw no evidence of fencing amiss. We did have a fox or perhaps fox and skunk attack over the summer. I just thought last night's was weird, since the predator didn't mark or make off with the prey, and rest of the chickens weren't scattered, but huddled under a bush. They huddle under that bush when hawks come around, so I wonder if it might have been an owl. Or, could a skunk have made a try, then gotten scared off by the commotion of the flock? The dead chicken has no bruising today, so I'm not sure what killed her, broken neck? Thanks in advance for any light you can shed on this!