Hi all We're getting two Aylesbury ducks in a few weeks. Could someone give me a hand with the size of the pen before my brain explodes! I cannot work out the square footage to save my life - math is not my strong suit! It will be a permanant pen as we need to protect from predators etc. but they will be able to get out and free range in the entire garden a few times a week. However, assuming it will be a permanant pen, with a small duck house inside it, would this be big enough? It's a 55" x 55" octagon shape. Would that be large enough? I don't want to give them too little space! Thank you!