I live in San Francisco, CA and have about 20 various hens that range over 3 large back yards. Yesterday I found a dead hen in the yard. It had the feathers torn off its neck and part of its body, but was not eaten. Today, when I was letting my hens out, I noticed a pullet born last summer was slow coming out of the shed. Her neck had the feathers all torn off, with dried blood. I put her in my garage in an area designed to raise baby chicks for her to recover. Does anyone know what type of animal does this behavior? I have skunks, raccons, and other night animals come around, as well as an occasional halk.