Most chicken pens will have some kind of roof or top. This is important for two reasons. First, it protects the chickens from predators. Chickens are very vulnerable to predators such as hawks, owls, and snakes, and a roof will help keep them safe. Second, a roof will keep the chickens dry during bad weather. Chickens are very susceptible to cold weather and can even die from exposure to the elements. So, a roof is essential to keeping your chickens healthy and safe.