I went to close up the coop for the night and I checked to make sure everyone was in a "cozy". When I looked in I saw four peacefully chickens snoozing on the roost, but I have eight chickens! the other roost was empty and so was the nesting box! I opened the big door and stuck my head in, sometimes they hid behind the door....nothing! I start to get really scared when I hear a little chicken noise from above me! Four of my chickens were perched an the pole I had put across the rafters of the coop to hang their food and water from! the pole is almost 6 feet off the coop floor! I had no idea they could get up there!!!! Any suggestions for how to keep them off?