You sacrifice power for speed in changing form.
Benefit: You can wild shape as a move action or a swift action. However, you are limited to forms available to a druid two levels lower when changing form as a move action, or four levels lower as a swift action.
Pathfinder Roleplaying Game: Ultimate Magic. © 2011, Paizo Publishing, LLC; Authors: Jason Bulmahn, Tim Hitchcock, Colin McComb, Rob McCreary, Jason Nelson, Stephen Radney-MacFarland, Sean K Reynolds, Owen K.C. Stephens, and Russ Taylor.