"A fieldmouse found a fallen hazelnut and began to bite into the hard shell of the nut with its sharp, ever-growing front teeth, not because it was hungry but because it was a prince under an enchantment who not regain his outer form until he chewed the Nut of Wisdom. But its excitement made it careless , and only the shadow that blotted out the moonlight warned it of the descent of a huge grey owl , who caught the mouse in its sharp talons and rose again into the night. ....... herself under a curse, and only able to resume her rightful shape if she consumed a mouse who had eaten the Nut of Wisdom, or perhaps a small bear."