Hello @riverflows.
That tunnel is great for the chickens to walk from one place to another. You always have to make adjustments to improve it.
I like chickens and would like to have a yard where they can be comfortable. As a child, I took care of some chickens that my dad bought, but I cried a lot when they were killed for food. Of course, I refused to eat them.
That guide to understanding their different sounds is great. I think all animals are intelligent because they adapt to their environment in order to survive.