http:// He sprang up to this height from a standing start! He made a few experimental attempts to walk along the top of the door frame, nearly came to grief when the door started moving, then sauntered delicately along the top of the door, when his back paws slipped ominously and his eyes widened in surprise. He was a very worried cat for a second or so, then regained his balance and finished by launching himself onto the sofa with a resounding thud. I was very impressed. What a brave little grey cat he is!