Tarakava

Tarakava - Huge lizardlike Rahi who used their long forelegs to deliver stunning blows. They hunted in pairs and stayed in shallow waters, as predators they lived in deep water. They hated Takea. When the Matoran of Mahri Nui were doing a test run for the Air Launcher (as a vehicle) they crashed into a Tarakava and died.

Twin-Headed Tarakava
This creature was created by Makuta and the Energized Protodermis Entity long ago. It had two heads, and was more moody then most Tarakava. Toa Metru Whenua and Nuju encountered this creature durring their search for the Onu-Metru Great Disk.

Tarakava Nui
The Tarakava Nui was one of the last creations of Makuta and the Energized Protodermis Entity. It stopped early attempts at building the Mata Nui village of Ga-Koro until Turaga Nokama and the Ga-Matoran drove it off.

Mata Nui Online Game
In the Mata Nui Online Game, you find that the residents are trapped underwater due to a recent attack by a Tarakava controlled by an infected mask. When Takua rescued the villagers, Toa Gali came to the rescue and defeated the Tarakava,removing its infected mask and taming it.