Zandalari hunters automatically know how to tame Direhorns. Hunters of other races must learn the skill from an Ancient Tome of Dinomancy which is a rare drop from Zandalari Dinomancers on the Isle of Giants in Pandaria. This skill is NOT account-wide.
Location & Notes:
Located in Primal Wetlands, Nazmir. Located in a cave under the waterfall in the far west of the area. Covered in Blood Ticks which are lost upon taming.