I have a cuckoo Marans 2+ year old hen in with a flock of 7. They've lived together their whole lives. A few weeks ago our black Cochin hen started missing feathers on her neck and then one day I saw why. The cuckoo Marans will pin the Cochin down with one of her feet and pluck out some feathers. Zebra (the cuckoo Marans) has always been my peacekeeper so to speak, so I'm not sure what the heck happened to make her torture (Puffy) our Cochin. My kids named the chickens btw. Has anyone else had this happen ?