New owner this year. We have 5 birds around 5 months of age and 6 birds that are about 2 months younger. One of those new birds was a runt (Cochin) and looked like a new chick well after the others tripled in size and feathered out. We kept that Cochin inside longer since it had no feathers and the others went out to our coop in a dog kennel for one month to get acquainted with the big birds. They all get along fine after the initial pecking order was established by my cockerels (have two right now, debating getting rid of one). Well over the 4 weeks the Cochin finally started growing rapidly. It (still not sure if he/she) is now the about same size as the other younger birds but still the runt of the group. We put this bird in the same kennel for 2 weeks alone in the coop to get to know the others. Tried taking it out and it was instantly attacked by the bigger birds and even some of the others the same age. Not just "pecked" but pinned down and plucked by several others! Poor Cochin lost a patch of feathers before we could get the others off. Put Cochin back in kennel for another week. Took it out and things were good for a couple days. Now it is back to the same issue - the big birds and still one or two of the others constantly harass this one. The Cochin keeps trying to hide his head under somewhere or duck under a bush and will get attacked from all sides. It just keeps squawking and running away like crazy. This is pullet and cockerels going after the Cochin. I've watched the others peck at each other and it seems "normal" to establish things. Put frozen fruit out and the cockerel goes first and the others come in later with smaller birds eating last type of thing. If others get too close the boys put a quick peck on them and all is fine. This is different. They corner the Cochin and once close enough fly up to grab it with their feet to pin down and then they start pecking it's back and neck. The Cochin is about as docile as can be and will come running towards us when we walk in the run and hide behind us or sit on our feet if we are standing still long enough. Anything we can do for the poor bird? I dont want it injured and it has been near a month now in the kennel. Several birds leave it alone all day. The others... it gets ugly fast. Right now when it happens we get after the other birds (tap at their tails and right behind their neck) and keep them away while keeping watch over the Cochin.