I have 12 week old Buff Orpington pullets. Ever since I introduced my 4 girls to their outdoor coop/run 3 weeks ago, at night they all huddle together and cram themselves in their small doorway to the coop. Half their bodies inside, half outside. I've even found one on top of the others trying to be positioned in the doorway as well. There is clearly not enough space for them there, yet when it's time to head in for the night, they always stop in the doorway, and they stay there until I force them into the coop so that I can close it off. Has anyone experienced this with their flock before, or perhaps have any insight as to why they're doing it? They seem content being there, but I just find it odd. Thanks in advance!