Geekitude

<blockquote> Shapeshifter
Major Supernatural Virtue
Choosing this virtue confers the ability Shapeshift 1.

You may change your shape into that of a mundane animal from size of a robin (-5) to that of a bear (+2). This requires a few seconds' (one round's) concentration, and a roll of Stamina + Shapeshift against an ease factor of 9. Changing back to human form requires the same concentration, and the same roll.
You have a limited repertoire of shapes, one for every point you have in the Shapeshifter ability. Every time you raise the ability by one point, you may choose a new shape.

Specialities : one of your shapes, particular conditions for the change. (Supernatural) <cite>Ars 5 p.48 & 67</cite> </blockquote>