Kavinika were wolf-like, bipedal Rahi once used by Ga-Matoran scientists to guard certain places, low - priority facilities and items. Unfortunately, they were overly aggressive and started to fight with each other, Rahi and Ussal crabs. The Kavinika then threatened their Matoran masters. The Ga-Matoran tried to drive the Kavinika out of Ga-Metru, but they had little success. Their population exploded for some unknown reason.