|Colors||gray, black, purple, light blue, white|
|Tools and Abilities||Wings|
Kahu were huge bird Rahi that were part of the Gukko family of Rahi. Gukko birds were extremely swift, and generally peaceful, though they would fight if threatened. Le-Matoran often tamed Gukko for their Gukko Force. Rahaga Kualus insisted that "Gukko" was the incorrect name for the species, and may even have been an insult in their language. A bright green energy filled a Kahu's wings when it flew.
- Kongu rode a Kahu named Ka with Takua in the MNOLG.
- Kopaka also rode a Kahu (in a concept art from Bionicle: Quest For the Masks TCG ; card #135)