The girls get to go out and free range for a couple of hours a day, but are destroying my garden beds. That is fine for now, but when the gardens go in, the girls need to stay out. I am planning to build a movable pen to keep them contained until the gardens are finished in the fall. I'm thinking of a wood frame with hardware cloth, but would like to see what others have come up with and get some ideas. I only have two birds right now and may get one or two more in the near future. How big should I make the square footage for, let's say 4 hens for a couple of hours a day. Thanks so much!