Thumper - The jumping gerbil

Ok, we are still working out how to keep the gerbils in a safe contained area while letting them roam a bit.  One of our gerbils, Thumper, just has the need to roam outside of any "contained area".  He is pretty smart to start with and is getting better at escaping contained areas and now has found that he can jump pretty high.  I think we will have to work on a way to contain him in our hallway by blocking off a few doors and such with towels - that will give some room to roam but prevent the need to empty out the "treasure" that my daughter tends to collect under her bed while trying to convince Thumper to come out.  Actually Thumper does tend to come out and I think he may actually like being chased a little - it is quite funny to see how easily he evades us. 

Here is a quick video showing how high he can jump.  I do fear that he will hurt himself if he keeps this up though.