My husband and I are freaking out. We have, make that HAD 4 wheaten maran hens that we've raised from chicks to their current age of 10 months and all of a sudden they're attacking and killing each other. Yesterday one was bleeding from a hole in the side of her back and in the morning she was dead. Today another hen is bleeding from the same place, side of her back and I moved her to our "bunny house". I'm guessing she's going to bleed out but I don't know what to do to help her. We have a large run in type coop with an attached run about 14 feet long by 8 feet wide and 6 feet tall. The run is covered in wire and plastic (for winter). There are several different perches and two large nesting boxes. We also have a trio of muscovy ducks in with the hens. Our muscovy drake somehow hurt his leg about a week ago and I'm wondering if he's trying to mate with the hens and causing a tear in their back with his claws and this is causing the other hens to see blood and peck her to death. Do you think this is a possibility??? Other than that, I can't imagine why they would start killing each other. They have plenty of feed (layena pellets and corn) and fresh water. I'm afraid the next time I go out, another hen will be bleeding or already dead. As for predators, what would squeeze in and wound a hen like this and just leave without eating her? We live in the suburbs but have seen skunks, raccoons and a coyote in the neighborhood before. Does anyone else keep ducks and chickens together?