I have 6 chicks (three BO hens, one BO roo, and two Dominique hens) that are seven weeks old. I call them the "Littles". The "Bigs" are three and four weeks older. (five EE hens, one EE roo, two RIR hens, one RIR roo, two Buff Brahama hens, one Buff Brahama roo, three BSLs, and three Partridge Barred Rock hens) The "Bigs" are led by "Vintage" the EE roo. The "Littles" are led by Belvadere Buffington the BO roo. Right now, they all live in the same coop and run, but the "Littles" have a mini-run inside the big run and they sleep in an extra large dog crate at night. I tried to let them all hang out together today, but the "Littles" either tried to get into their little run, hid under me, or ran screaming while being chased by various "Bigs", particularly Vintage. Should I wait to move them all together until the BOs are more the same size, they seem to be catching up quickly? What is the best way of going about this?