I have 3 EE hens and today one of them is suddenly lacking feathers around her rump??? She was perfectly fine yesterday and the other 2 are still ok. There are no feathers on the ground or in the coop so it's a complete mystery as to what happened over night. I did a complete clean out of all bedding and found no bugs in the run or in the coop. Any help or tips from the experts on this forum would be greatly appreciated. Thanks