Reek

Reek were large, bull-like creatures native to the planet Ylesia and the Condian Moon. Despite this several Reek could also be seen immigrated on planets such as Saleucami and Geonosis. One Reek from Geonosis was seen in the Petraki Arena before the start of the Clone Wars and was used by the Separatist-allied Geonosians to attack a group of Republic prisoners, before one of the prisoners, a Jedi padawan named Anakin Skywalker, used the force to tame the Reek and use it to help them fight in the arena, even using the Reek to kill a Nexu in the arena.