My friend lost 9 chickens yesterday. They dissapeared with some feathers strewn about. One came back with a 3-4" oval area of skin missing below it's wing. She lives at the end of a cul-de-sac backed by state forest. What could have taken 9 chickens? Also, she just added roosters to her flock and there is a lot more noise. She wandered if this is attracting a preditor. Any input is appreciated.