It is summoned by using a bull ant pouch, which will give you 0.6 Summoning experience. Apart from being able to Store up to 9 items for you temporarily, it also has a special move called Unburden that restores running energy based on one's Agility level, which can be activated if you have an Unburden scroll in your inventory. The amount of run energy restored is half of your Agility level. The Bull ant, like all other Beast of Burdens, is immune to poison damage. It can also give the summoner's weapon a 20 lp poison effect. It originally could only hold 3 items but this was increased to 9 with the Summoning 2 update.