I am ready to take the 6 old girls out of the large coop and into another. I plan to put two 9 week old white leghorn pullets with 6 Buff Orpingtons and 6 Ameraucanas (all of which are 5 weeks old) into the large coop (12'x8'). Any suggestions for how I should go about introducing the leghorns to the rest of the young flock?