Yesterday, we were doing some bottling in the kitchen. Our birds who live in the kitchen (Calypso and Brian) were there with us and so were the greys, who'd flown in as they like to be where we are. Basil was hanging out on his cage. Beeps was locked inside his cage as bottling is an activity that triggers him to attack us. Rocky was free to roam around the living room, which usually means he's ripping up phone books under his cage.
What this boils down to is light supervision of the parrots in the living room (Basil, Beeps, and Rocky.) By "light supervision" I mean that we listen closely for any sign of trouble (Rocky and Basil are notorious tattle-tales; we also listen for any flight) and I go in to check on everyone approximately every 3 minutes. I must also add that Rocky and Beeps get along and ignore Basil. I would never trust light supervision with Brian (due to size difference) or for any birds who have shown any problems with each other in the past (Max-Beeps, Calypso-Beeps, Max-Rocky, Calypso-Basil...)
On one of my three-minute checks, this is what I found:
Beeps immediately climbed on the nest box door; I wasn't fast enough to get a picture of him perching on it, as Rocky decided to exit as well, prompting Beeps to take flight:
With an audience, this is the first way he chose to approach his problem:
As soon as I returned to the kitchen, he got himself out of the cage and then walked in to the kitchen. I suspect he wanted to show me that he knew how to get out all along.