I've lost two 8 month old chickens to an unknown predator in the last two weeks. In both cases, the chicken is intact, but all the tail feathers are gone. One had a puncture wound to the back and the other had scratches, but unknown cause of death. They were not missing any body parts. The two attacks occur a week and half apart. Any ideas of what could have gotten them? I live in the city, with a 5 ft fence around my back yard. Lots of trees and bushes. The chickens free range in the back yard. Feather were found both in open areas and under bushes.