The wife, kids and I have recently caught chicken fever and we love it! We have 3 white rocks that are out in their pen at night and free range during the day. The others we have in a few seperate cages depending on their age and heat needs. As they get older and get a pen of their own, what would be the best way to give them free range time without having to worry about roaming and xbreeding with the others. We plan on having pens for each type of chicken. Thanks for your time and ideas.