Ah African Gray parrots

A friend found a play pen for my birds at a garage sale. It looked perfect.  It’s up on a tall stand, has wheels, is all metal and looked as though there was no way to climb off it. It took my African Gray Abdul about ten minutes to conquer it. He climbed to the edge, swung his body down while clinging to the metal tray, got his body going in a swinging motion and managed to swing to the legs of the stand, slid down the leg and was whistling merrily on this way to the computer wires under my desk in less time than it takes to write this.  I am completely amazed that these birds do not rule the world.