Wondering why my chickens won't go in the coop of my newly constructed tractor. The hole I cut is round and the size of an ice cream pail. I know they will fit because they went through it to go out into the run but they will not go back in the coop to roost or lay eggs. They are used to a much larger coop maybe that is the problem. The coop is diamond shaped 4x4x6 and 2 ft. wide.