I have 2 peking ducks that are approximately 5 weeks old. Im just wondering how old they should be before I put them outside? They seem ready, and are still in a large kiddy pool inside for now. I think its going to be hard to make the transition! Also, is a fairly large wooden doghouse appropriate housing for them? If so, should I put a door on it to close them in at night?(with ventilation of course). Thanks!