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Taku were a species of very small bird-like Rahi on Mata Nui and Metru Nui. They were aquatic and could dive to great depths to catch fish. Shortly after he washed up on Mata Nui, Toa Lewa used his Air powers to save a baby chick of this species from falling to its death; ironically, the Toa of Air was the reason the chick fell out of its nest in the first place.
Later, during the Bohrok War, the Gahlok swarms forced many Taku living on the coast to migrate closer to the beaches, where many fell prey to Takea sharks. Following the rediscovery of Metru Nui, many Taku migrated along with the Matoran to the city.