Question for chicken flock experts! I started out with five 2 week old sexed pullets for our first backyard flock in March. Long preditor story short we were down to two as of this month. They are almost 9 months old, and have been laying since the beginning of August. After finally preditor proofing our girls, I bought two more this Thursday to replace our losses. One 7ish months, and one 4ish months. We introduced them through the fence first, and they did notice each other. We let them get familiar until this afternoon (Friday), and then let them roam together. I observed them for a while, and saw some mild bossing from my girls to the new girls, but nothing major, and then they seemed ambivalent to one another. After a few hours I checked again, and the fourish month old was laying still. When I got to her I saw that they had pecked her little head bloody! She is in a seperate pen now with vitamin and electrolyte supplements in her water, and doesn't seem to be seriously injured. The other, older new girl is completely peck free, but I noticed she still runs from my two or hides. When night fell, they were all three roosting together in the coop so I left the new girl with them when I locked them in. I plan to let them out before dawn so she can run and hide if she needs to though. My question is, will I be able to integrate the two new girls successfully? How can I do it? I don't want to keep the youngest girl a stranger to a full grown flock until she is older, but I definitely don't trust my girls not to kill her. Help? If it's helpful to know my two girls are a Columbian Rock and a Red Sussex. The older new girl is a Silver Laced Wyndotte, and the baby is a Buff Orpington.