Hi, I have 5 -10 week old pullets, and 4 -5 week old pullets. The 10 w.o.'s are substantially larger then the 5 w.o's. Now the the younger group is fully feathered, I decided to let them all meet and see how it worked out. (think since they are all young it may be a good time to let them begin to know each other) Well, there are two distinct camps and they don't mix. The older birds are chasing and pecking at the younger group. Will this behavior stop? Should I keep them separated until they are older? Any info or advice?