http://gizmodo.com/gadgets/gizmodo-lunc ... 255928.php
video of someone using the mouse: http://www.instructables.com/id/EM1O9XJF0YPF7M5/ also contain instructions to how to make the mouse on the webpage.
Gross, but it's good that they recycled the dead mouse's body and used it for making somrthing useful. If they had a brown furry wire on the mouse it be more realistic, or if it was wireless. the scroll wheel should be orangy brown color.