I have 8 chickens in a chicken tractor. They would have plenty of room at night if they would use the 4 rungs of the ladder type roost in their house area. However, they all jam on the top rung and one even sleeps in the elevated nest box (ugh!). I've been having some feather picking overnight, which I'm sure is a result of all the jostling/competing over the top space. The bottom rung is 18 inches off the house floor so it should be high enough to be used as a roost. Will they eventually spread out (I've had them for one week)or do I have to thin the flock so they can all fit up top?