This. Is. Gelada!

Thus did war rage between the Geladas and Mangabeys. Meantime the Mandrill pursued his own design, from day to day exhorted by his servant to "remember the Mangabeys," and likewise urged continually by the Macaques, who were ever accusing their countrymen. Moreover it pleased him well to have a pretext for carrying war into Papio, that so he might reduce all those who had refused to give him earth and water.