Snake
This NPC can be found in Zangarmarsh (209), Zul'Gurub (88), The Black Morass (68), Dustwallow Marsh (60), Wailing Caverns (40), Desolace (29), Sunken Temple (27), Dire Maul (23), Eversong Woods (21), Un'Goro Crater (18), Feralas (18), Hellfire Citadel: The Shattered Halls (18), Maraudon (23), Westfall (15), Silverpine Forest (7), Ghostlands (7), Howling Fjord (7), The Barrens (6), Gundrak (6), Hellfire Peninsula (5), Black Temple (4), Nagrand (4), Grizzly Hills (3), Coilfang: The Steamvault (2), Terokkar Forest (1) and Silvermoon City (1).