I have 4 hens that were raised as chicks - now 18 months old and pretty peaceful and friendly. One of these girls went broody in May and hatched a clutch of borrowed eggs and we kept two of those chicks. The chicks are almost full grown-sized now (almost 4 months old) and the adults still viciously peck at them while they are our free ranging together during the day. The two youngersters roost in a tree in my backyard while the adults always roost in the coop. I do have a tractor that I used to protect the chicks when they were younger - and I sometimes let them free range around the yard without the adults - and when there is enough space to get away - there isn't much aggression when they are all out together. Within a few weeks it might be too cold at night for the youngsters to roost out in the tree - but I don;t think that the adults would let them come into the coop. Do I need to build a small 2-bird coop for these youngsters until the adults accept them into the flock?