If you ever watched some mice
Spinning round on their wheel.
You may have thought it wasn't nice
To make them go through this ordeal.
Yet you would be very wrong
To pity them for labor hard,
It turns out that all along
They may have thought it was a reward...
This was proven by some Dutch
Scientists, who on their ground
Built a treadmill that was much
Appreciated by mice around:
Wild mice visited the wheel,
As if it were a cherished gym.
They'd hop on and off at will,
And enjoy it to the brim.
The behaviorists surmised
That the wild mice did enjoy
Both the offered exercise,
And the humans' mousey toy...