A race of insectoid robots who travel in swarms, their purpose is to clean the island of Mata Nui as preparation for his awakening. They come in 6 different breeds, each with their own elemental power.
These include:
Tahnok (Bionicle), Bohrok of Fire
Gahlok (Bionicle), Bohrok of Water
Lehvak (Bionicle), Bohrok of Acid
Pahrak (Bionicle), Bohrok of Stone
Kohrak (Bionicle), Bohrok of Ice
Nuhvok (Bionicle), Bohrok of Earth
They are led by two Queens known as the "Bahrag" named Cahdok and Gahdok.
There also exist and elite group of Bohrok called the Bohrak-Kal who wield a different set of powers.
Tahnok-Kal (Bionicle), Bohrok-Kal of Lighting
Gahlok-Kal (Bionicle), Bohrok-Kal of Magnetism
Lehvak-Kal (Bionicle), Bohrok-Kal of Vacuum
Pahrak-Kal (Bionicle), Bohrok-Kal of Plasma
Kohrak-Kal (Bionicle), Bohrok-Kal of Sonic
Nuhvok-Kal (Bionicle), Bohrok-Kal of Gravity