For the past two days me and my dad have been working non stop to clear the woods for my chickens. We just finished putting posts in for the fence. However he bought 4ft fence which is fine for the Barred Rocks but I am also getting bantams such as silkies and sultans <3. I know they can fly a little bit or jump since they are a little lighter and smaller. Is the 4ft okay or should he get 5ft just incase. Keep in mind that it is a HUGE area and the chickens will have tons of room i don't have the exact measurments but its close to a large barn size. Should he get the 5feet to be safe because if he does end up using the 4ft and the chickens get out he will lose almost 200$ in fencing to get more. The problem with 5feet is that 3 of the posts which are for the rabbit fence ar only 4ft long so since we are attaching the chickens to the rabbits fence the extra foot with the 5feet fencing would go way over the posts. Comprende?