Sidebar: the chicks had been taught to go to bed at the words: 'Bed-bye'. In the beginning it didn't occur to me that 'Bed-bye' to the chicks would mean for them to go to bed in their chick house. They made this association clear to me the first night when all were in bed in the big house except one. I said, 'Bed-bye' and they all came flooding out of the house to stand by the chick house door, waiting for me to open it up. Sorry, kids. My bad.
A day or two after that, after tucking them in for the night in the tractor, we moved the chick house out to repurpose it for other things.