I had 12 fat beautiful productive layers . a month ago I found one dead beside the coupe during their 5 hour yard time . Thought it was a cat since it wasn't eaten except by other chickens pecking. Two weeks later another day light killing on my back porch . Getting mad at the cat , or what ever . Last night same kind of killing in the coop. No sign of forced entry and not eaten except by pecking. Are they killing each other?