Crows are definitely smarter!
Chooks are curious creatures and they do get bored if they are locked up in a small space. Ice put some ladders at various angles with containers of treats to climb up and the tunnel and second yard keeps them busy too. In the late arvo they love being in the sun behind the shed. I do sometimes let them out in the big garden but not for long or they destroy everything. The tunnel was a great solution. I joked with Jamie we will build a monorail next a md a shed roof garden.
He didn't find it funny.