For information on the specifically named mob, see Warp Stalker.
Warp stalkers are predators corrupted by the Burning Legion, found native to Draenor, in the areas of Terokkar Forest and Netherstorm. There are reports that Legion officers use warp stalkers as mounts. Warp stalkers will sometimes prey on travelers. They are both smart and powerful, with the ability to phase into and out of the physical and astral dimensions. This ability disturbs magical energy, making them an annoyance to magic-users.(WoWtBCOSG 331)
Due to their dragon-like appearance and useful species skill, they are popularly picked up by hunters. However, hunters should beware the Warp Stalkers found in Terokkar Forest, as those have caster stats. Luckily, the identical looking Warp Hunter, which does not have caster stats, is found nearby.