One of my four chickens (my favorite of course!) turned out to be a cockerel. Luckily the farmer I purchased my chickens from is happy to swap him for one of his sisters, same age same Brahma/Aruacana mix. I'm looking for some advice on introducing the new pullet to the other 3. They're all relatively the same age, 4-5 months old. The other three have been together for a few months and get along fine. My chicken yard is 20x30' with a 6x8' henhouse/run where I keep them at night. Any experienced advice would be helpful!