I bought six baby chicks in April. 2 Americauna 2 Barred Rock 2 Buff Orpington Four of them started laying about three weeks ago. From what I can tell two of them have not started. They also don't demonstrate the same behavior as the laying chickens,, they don't squat down when I approach them. Could my Buffs be late bloomers? Or could they just be non laying chickens? I live in Northern California.