Rat
This NPC can be found in Stranglethorn Vale (2), Arathi Highlands (16), Alterac Mountains (7), Hillsbrad Foothills (5), Stonetalon Mountains (6), Desolace (32), Terokkar Forest (52), Shattrath City (9), Nagrand (17), Azuremyst Isle (3), Bloodmyst Isle (18), Stormwind City (26), Ghostlands (25), Silverpine Forest (5), Tirisfal Glades (81), Western Plaguelands (6), Undercity (2), Howling Fjord (71), Grizzly Hills (6), Dalaran (2), Drak'Tharon Keep (2), Naxxramas (26), The Culling of Stratholme (20) and Violet Hold (1).