Having raised and bred chickens for many years. there are certain rules for introducing new chickens into the existing flock. One of the best ways to introduce new hens is to put newcomers in a run / small fenced off area within the existing run so that they can see one another and get used to one another but with the safety of the wire between them. Once a week has passed, the newcomers can be popped into the coop at night, but make sure you are there at first light in the morning to rescue them if blood is drawn. Another way is to put them with your existing flock in a house and run that is new to both of them with lots of space and lots of food distractions. Neither of them has an established territory and this can sometimes work well, especially if they have lots of space to stay away from one another at first. This isn’t always possible though. read below for the many things to do with this new addition.