Who knows why chickens do the things they do. The other night we had friends over in the evening, so it wasn't til late that I went out to shut the coop door. Stepping onto the porch I almost tripped over a hen sleeping on the porch floor; there were two more on the railing. The other six were crammed into the small open coop I made for the little hens to live in at the end of the summer. None of them were where they were supposed to be, in their own house. When it's dark chickens don't really move around much, so it wasn't hard to grab them one at a time and carry them to the henhouse, but it did take a fair while. I figure that the wind must have blown the door shut in the evening when they were still out, and when they couldn't get home they had to make other arrangements. It was open when I got outside, but whatever.
The next night I was late again. It looked like everything was as it should be—door still open, no hens to be seen outside—but I thought it would be ok to check just in case. And count. Seven hens roosting comfortably... out of nine. Hmm. This time it took me a little searching before I found the other two, cuddled up on the ground at the base of a tree. I picked em up and threw em back in. Last night it was just after dark when I got out, but dark comes early these days and the hens were once again abed—eight of them this time. The last one didn't take any trouble to find, though: she was right where she'd been the night before. Today it was wet and snowy (and we had our health department inspection) so I didn't let them out. Everyone will be sleeping where they're supposed to be!
It's not that I mind them making alternate sleeping arrangements if they don't care for the home I built for them. I'm not offended! But I do like to see them in the morning, and given the wildlife running around here I wouldn't be too sure about their survival chances outside their hardened shelter. We're hearing owls—multiple owls—hooting around the house just about every night lately, just for one example.
That said, they'd probably be fine most evenings. At least twice I've closed up the run without counting and had a hen spend a night out in the open, with nothing bad happening. The only two hens we lost to predators were both in the daytime, to hawks. But there's no reason to take chances. So at least when I'm paying attention, I'm going to take the trouble to put all of them in. Hopefully they'll figure it out on their own and stop trying to make alternate arrangements. But, as I say, they think for themselves—there's no telling the mind of a chicken.