Unknown Bakugan are bakugan from Ultima Vestroia that do not exist in large amounts. 50% of the Unknown Bakugan Races are extinct.
They have no special appearence
Burst Bakugan species are included in this as the rest of their race is either extinct or in low quantity of population.
List of Unknown Bakugan speciesEdit
Claw Splight (Extinct)
Freedom Dragonoid (Extinct)
Flame Apexeon (Extinct)