I just built the pens, but I've been using the cages for almost a year. I have adults in them at all times. I will be using my other coops outside for growing out birds this coming year. My cages are 22 1/2" x 70 1/2". Oh, I mainly have bantams, so they are good for about 4-5 birds each cage. I don't like putting more than 4 in them. I have the LFs outside in another coop. I could put LFs in the pens, though.