My small coop of 4 chickens has an issue. Every night so far ( only been in it 4 nights ) they all try to roost on top of the external nest box up by the hinges. I think I see the problem in this pic. To me it looks like the roost is a couple inches shorter than the top of the nest box. I can't raise it since there is not much headroom as it is. http://s1116.photobucket.com/albums/k576/littlechickenbawk/?action=view¤t=100_0402.jpg Any ideas?