I just got my 8 week old pullets and put them in the coop today. There's a big run and then a long ladder leading to the henhouse, which is about four feet off the ground. Will they know to climb the ladder to get into the henhouse or should I put them in there to explore? I want to make sure they go in there to roost at night and not stay in the run area. We don't have a door to the henhouse yet (inside the run).