Rat
This NPC can be found in Stranglethorn Vale (2), Arathi Highlands (16), Hillsbrad Foothills (4), Alterac Mountains (7), Silverpine Forest (6), Terokkar Forest (46), Shattrath City (8), Nagrand (24), Azuremyst Isle (3), Bloodmyst Isle (18), Desolace (32), Tirisfal Glades (89), Stonetalon Mountains (6), Stormwind City (26), Ghostlands (25), Violet Hold (1), Howling Fjord (71), Grizzly Hills (6), Crystalsong Forest (2), Dalaran (2), Drak'Tharon Keep (2), Naxxramas (100) and The Culling of Stratholme (20).