"Monday, Monday:" Gerbil:0; Exercise Wheel: 1

20070515.gif
TheMOT.org, via doingitwrong.com (May 15, 2007)

I think this is a gerbil, and an exercise wheel. I'm not all that familiar with domesticated rodents.

The animated GIF shows the little nibbler jump on the exercise wheel: and have what I'll call a "Monday" experience.