My adult Cubalayas clear a 6 foot high fence without a problem from 4 or 5 feet away from it. All of my pens are covered for several reasons , ariel predators for one and to keep track of breedings( who sires which chicks). Also to prevent fighting between cock birds, I have one that will not quit. I free range my young Cubalayas starting at 6 weeks. Keeping them too closely confined can result in feather picking and cannibalism, some familys are more prone to this than others . I learned the lesson the hard way. Hope this helps you, some of the others here will most likely have more valuable advise.