You can wild shape into animals of Colossal size.
Prerequisite: Gargantuan Wild Shape.
Benefit: The character can use his or her wild shape to take the shape of a Colossal animal.
Normal: Without this feat, a character cannot wild shape into an animal of greater than Huge size (or Gargantuan if the character has the Gargantuan Wild Shape feat).
Source: Standard Reference Document under Open Game License v1.0a, which updated this feat originally published in the Epic Level Handbook, page 52. Corrected the Normal entry if the Gargantuan Wild Shape feat was possessed.