I recently took in 6 younger chickens that needed a home. Someone though they would be a cute gift, and we all know how that generally goes. You need to be prepared for this. I am just starting out myself, I wanted to raise chickens and had bought some reds from TSC. They are now 7 weeks and the new, inherited chickens are about 3 weeks younger. If I partition the coop and run, I do not feel there will be enough room for either set of chickens. All of the other threads talked about multiple coops and 4 weeks of time next to each other and such. I do not have that luxury? I am also working real hard to get my current chickens to use the roost and not use the nest boxes. I do not want to mess that up. Any suggestions for a quick integration?