Totally Tubular

Bertie can move a tunnel from the second floor to the first in less than a minute, but not every attempt is successful.  I managed to video one such botched attempt.  Bertie seemed to be making a good go of it, but then Pinni decided to get involved.  It seems that instead of getting the tunnel down to the first floor, they end up using it as a sort of a slide.  I've seen several examples of the tunnel hung up between floors like this, or jammed like an elbow pipe jammed in the corner.  It seems that neither one has figured out that they can pull the tunnel down from the second floor.  Yup - these two are not the brightest bulbs in the bunch.

Watching Pinni's involvement makes me wonder if she's has been involved every time the tunnel gets stuck between levels?  I always thought that Bertie was the more air-headed of the two of them, yet she applies herself to the task with more intent than Pinni.