Hi everyone. I am new here. I have had my 6 hens (no rooster) since April 2015. I relocated their run and coop to a new spot in the yard on Sunday. There were a couple of feathers scattered, but I hour hr nothing of it since I had moved all of them. I didn't notice any additional feathers after that. Today, when I got home, I had a dead hen. No puncture wounds or any signs of attacked. However, there were a few feathers on the ground. She has no visible bugs or worms, but her vent looks extremely wrong. What would cause this?