We just came home from vacation and found our 8 month old black australorp dead. She had rigor, but her body core was still warm (warmer than the 47 degrees it is here anyway). No evidence of any physical damage and she was inside the coop with the other 13 birds and it is very secure. A neighbor kid was taking care of them and I don't think she did anything wrong, but I don't know if there were symptoms up until she died, which must have been last night. When I looked really carefully into her feathers I find at the base of her feathers on her stomach and back towards her butt there is an off-white substance oozing out of her. A bacterial infection of some kind? Does anyone have any ideas what did this? Egg-bound? I have no experience in this kind of death. The other chickens appear to be fine and were quite happy to get out and free-range again. My rooster came over kinda submissive like and gave her a gentle peck on the face when I showed him her body.