Sometimes when a mother hen decides it is time to go back on the roost, it can be a traumatic experience for her chicks. They are used to spending the night with her in a nest on the ground, and that first evening when she flies up, they can peep frantically, not knowing why she is way up there, and not in their usual sleeping place.
A few nights ago when I went to close the chickens in for the night, I couldn’t find the mother and her chicks in their usual nesting place. I was pleasantly surprised to see the little chicks made it all the way up to the top roost on the first night. It’s seven feet up, with a lower roost below. Not a problem for these little ones.