Snake
This NPC can be found in Zangarmarsh (217), Zul'Gurub (88), The Black Morass (68), Dustwallow Marsh (66), Wailing Caverns (40), Desolace (29), Sunken Temple (27), Dire Maul (23), Eversong Woods (20), Feralas (18), Un'Goro Crater (18), Westfall (15), Tol Barad (14), Gilneas (11), Howling Fjord (10), Ghostlands (9), Hellfire Citadel: The Shattered Halls (9), Gundrak (7), Silverpine Forest (7), Auchindoun: Sethekk Halls (6), Maraudon (23), Black Temple (4), Nagrand (2) and Coilfang: The Steamvault (1).