Diminutive Wild Shape
(Epic Level Handbook, page 53, DnD 3.0)
[Epic, Wild]
You can wild shape into animals of Diminutive size.
Prerequisite
Ability to wild shape into a Huge animal
Benefit
You can use your wild shape to take the shape of a Diminutive animal.
Normal
Without this feat, you cannot wild shape into an animal of smaller than Tiny size.