My birds keep roosting on the best box. I put a big piece of wood over the top of the boxes at night and now they just hang on the little lip on front of the nest box. I have a perch that is slightly higher then the boxes but a chosen few still roost on the boxes. Then I saw one go up there today and poop in it. Not good! I'm going to post some pics for suggestions please. This is the best boxes and the perch I have This is a pvc perch that allot of them roost on. Maybe it's not enough room and I should make another one?