By bringing forth the primeval ancestry of the target animals, you awaken a savage engine of destruction. The animals immediately gain the advanced creature simple template. They gain a +2 bonus on all rolls, including damage rolls and special ability DCs, a +4 bonus to AC and CMD, and +2 hit points per HD. The animals's primal instincts take hold for the duration of this spell—if the animals know tricks granted by the Handle Animal skill, they lose access to all of those tricks save for “attack.” This spell has no effect on animals that already have the advanced creature template.