Rat
This NPC can be found in Tirisfal Glades (89), Scholomance (55), Desolace (32), Arathi Highlands (16), Stormwind City (13), Zul'Gurub (11), The Deadmines (11), Scarlet Monastery (10), Alterac Mountains (7), Silverpine Forest (6), Stonetalon Mountains (6), Hillsbrad Foothills (4), Stranglethorn Vale (2).