I had the same issue this spring as my Bantam order ended up being exactly a month after my standards. I had them in and out a few times with the others, but the bigger and older stanard seemed to think that the Banty's were food that runs fast. I ended up setting up the tractor and a small cage next to each other for a few days, then added them again. This helped a lot--not everyone was chasing them, but some still did. I would come and find the bantams hiding under something that the standards couldnt get under. The finals solution came one day when I decided to try freeranging. I turned the Bantams out first for a few days so they knew the lay of the land first--then one night stuck them in the tractor with the standards. early that morning I let them all out to free range together and I never have had another problem. They are now a truely mixed lot with absolutely no problems tween the two. They have been banned from freerange for a while as they started to eat everyones tomatoes, so they are back together in the tractor --but still no problems!