I have a run and on weekends when I'm home I open it and let everyone range. I used to prop the bottom edge on a box and let them scoot under, and always, one or two can't figure out how to get out and they get anxious and pace...I've switched over to a hinged lid on top and take the roof off on 1/2 the coop, so they have 2 ways to get in and out..It still takes a while for all of them to figure out how to get out...But I've noticed my RIR rooster lately had trouble getting out and never puts himself back in....I wait until after dark and they're all put away but him, once he nested himself in a box full of old litter after I left out near the coop after cleaning, and I lifted him out and into it. Last night, he nestled on top the coop alone, he could easily have stepped off into the open run and them into the coop, or walked over the peak of the coop and into the open roof...I'm wondering is it possible he can't fly well to put himself away. But last night he'd already lifted himself up on the coop, but didn't drop himself in..Is it possible he's keeping himself out to guard the girls? He is only about 20 wks old, but for months he's been going inside with them. Now why the sudden change?