So after swap meet, I have challenge of adding 5 light brahma's to an old pair of wyandottes. All bantams. After giving everyone time to see each other. the wyandottes are in pen (15 X 15) so I turn the brahmas out in house (6 X 8). no body moves for over hour. then the brahmas go out, the wyandottes go to back of pen, brahma's to other end. Now the brahmas are outside and wyandottes are back in chicken house ready to go to bed. The 2 roosters neither one want to fight. hopefully when they do (I know they will eventually), it'll be quick and over. They are both "big" chickens, gotta love it. Neither are overly aggressive.