I have two 2-yr-old hens. Recently got two 10-week-old girls. They are separated inside the large coop. A friend of mine says I should not have 4 chickens. either 3 or 5 or a million. She says that 3 will hate a 4th. But I thought since they are different ages, two of each will stick together? I'm worried about pecking. I let them be together for a while when i'm in the coop, but i do have to intervene. I'm hoping to fully integrate them when the 10-week-olds are almost fully grown. I love my girls! they are the best pets i've ever had! So, my friends says I need to go out and get a 5th; another 10 week old. Is this true???? thanks everybody!