Huturu

The Huturu is a methane breathing aquatic animal found on Bahalo, the Unggoy's homeworld. They are a very popular meat eaten by Grunts and is used in Huturu racing, a sport involving Grunts riding Huturus through obstacle courses while trying to stay on making almost certain death. These animals are huge, some larger then blue whales from Earth, reaching up to 100 meters on rare occasions. They can be domesticated and are of little use to the Covenant though.