My kids will be 12 wks this weekend. Usually when I check on them in the morning (4:30 horse feeding before going to work) it is pretty dark but they have always been huddled on ground. I knew there was some use of the roost going on from the droppings and feathers under it but this morning I actually caught all 9 lined up on the top bar. Not sure what I put the other 3 bars up for unless it's just for stairs except I have seen them walking up the side rails. They may eventually get to big to fit all 9 on one bar.