the gerbil's den

Herby and gerby have dug into their boxes and set up a neat tunnel system. Before I get pictures up (not sure how I'm going to) let me try to describe.

They have two boxes stacked on top of each other, with a hole linking both. They first dug downwards into the top box (entrance #1) and dug through the hole linking the two boxes and they chewed around the hole to enlarge it. Then they dug backwards through basement 2 to exit from the back of the box (near the back of the tank), and they dug upwards, creating another tunnel entrance from the back of the tank going straight to basement 2.

Rocks huh =)