I have four 6 week olds and three 1 week old chicks. Since its been in the 70s here during most part of the day, I've been letting the littlest run around the yard with the older four. It seems like the four stay together and the three stay close together but don't intermingle very much. Is this normal since they aren't used to each other? It sounds strange, but I want to make sure I won't have any issues when the little ones transfer to the coop. thanks!