Tarakava

Tarakava - Huge lizardlike Rahi who use their long forelegs to deliver stunning blows. They hunt in pairs and stay in shallow waters, as predators they live in deep water.

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 you rescue the villagers, Toa Gali comes to the rescue and defeats the Tarakava.