Sea-mice, diminutive beings resembling mice, possessed the unique capability of amphibious existence. They could transition between terrestrial and aquatic life by transforming their paws into fins, and conversely, a biological adaptation called corpus mutatio facilitated this. Originating from Alderaan, numerous sea-mice had also established populations in specific regions of Kamino. Given that Kamino is a world completely submerged in water, the majority of sea-mice residing there had forfeited their capacity for corpus mutatio. The destruction of Alderaan by the Death Star in 0 BBY resulted in the complete extinction of sea-mice still capable of utilizing corpus mutatio.
Frequently, sea-mice served as a dietary source for domesticated sea eels or rollerfish.
Iiaa was the term used by the Kaminoan people to refer to "sea-mouse".