We are planning to start chickens before next winter. (A project for next summer.) As I start thinking seriously about a coop I realize that the first thing to know is : how much room does a chicken need? While looking at the coops displayed on the site, it's hard to guess and I can't find any reference. If I have 5-6 Orpingtons will a "small", "medium" or "large" coop be proper.