Snake
This NPC can be found in Westfall (27), Silverpine Forest (65), Un'Goro Crater (41), Feralas (8), Dustwallow Marsh (69), Desolace (31), Maraudon (14), Zul'Gurub (40), Sunken Temple (9), Wailing Caverns (15), Dire Maul (22), Zangarmarsh (262), Ghostlands (2), Eversong Woods (2), Nagrand (2) and Black Temple (12).