My 2 little silkies are 9 weeks and I'm starting to prepare their transition to the coop with my 2 big girls. We have a full grown welsummer and a wyandotte. The silkies are small and as I'm reading about combining chickens, everything says not to add smaller birds to a flock of bigger ones. I'm getting nervous. Can it be done? Or are they going to be separate for life? I'd appreciate any advice. I let them free range together for about an hour recently, but it's a big space and the chickens didn't even notice the chicks. I am going to move the chicks' enclosure next to the chickens' coop so they can adjust a bit that way.