Neither do we.
LaLa and Izzie are tall enough that we needed to get a new box to put them in when we (read: I) clean out their abode in the dining room. Today both of the buggers had their heads up and over in a moment that said, "I can see over this box and tomorrow I'll be able to hop these walls moohahahah."
Mister likes to stop and look in on them. Izzy makes him laugh as her grand occupation is pecking the walls of the box from wherever she's sitting, standing, lounging.