This is just my opinion and experience but when people ask me about adding chickens this is my suggestion. You should never try to add just one bird. There is power in numbers and since chickens are social animals, one chicken alone is just a target. I would add at least two and add them at the same time (buddy system). You want to choose birds that are of similar size at least. Personally I like them to be around the same age as well but not as important to me at size. The new chickens are at the bottom of the pecking order therefore if they decide to go hide their head in the corner they are basically dead meat. They must stand their ground in the flock. I would suggest that you add a treat that is the favorite of your current flock at the same time that you introduce your new birds. Something that they can not resist. Stand back where you can see them but not interfere. They are going to peck and chase and let it happen. If it becomes violent to the point that you feel you must interfere then I would suggest that you put the new birds inside a cage and place that cage inside your coop. This way the birds can see each other and not kill each other. Each day go and try again. Usually it will work without having to do the cage thing. If you try to add smaller birds than your flock you are probably going to find that you regret that decision. Again just my opinion.
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