Rolling Ball (3.5e Feat)
From D&D Wiki
 Rolling Ball [Racial (Anthromal)]
You are able to move while in a defensive ball.
Benefit: An anthrohedgehog that is in a defensive ball can move around as though he were standing on his feet.
Normal: An anthrohedgehog without this feat is immobile while in a defensive ball, though he doesn’t lose his Dexterity bonus to Armor Class.