Introducing like numbers and like sizes is the least problematic. So adding a single chick to any group of adults is fraught with complications but especially with RIRs.well 3 of my chickens are rhode island pullets(MEAN!!), i was given them after the bigger ones so they have their clique, the laying hens breed and the rooster have one too, the size and color difference would make the surviving the odd one out and he/she definitely cannot win a 1v10and yes he/she has a cage in the coop now, but since they free range most of the day if i leave he/she in the coop that is when im afraid it will get lonely
