Artakha Bull (arr-TOCK-ah)
A swift, strong, plant-eating RAHI who relied on its sharp horns for defense. The Artakha bull was considered to be one of the earliest RAHI known to MATORAN and was rumored to be extremely intelligent. The species lived in LE-METRU on METRU NUI, but none were ever seen on MATA NUI (2).
Source: BIONICLE Encyclopedia Updated