Rat
This NPC can be found in Stranglethorn Vale (2), Arathi Highlands (28), Alterac Mountains (4), Silverpine Forest (8), Hillsbrad Foothills (5), Stonetalon Mountains (9), The Barrens (4), Desolace (25), Terokkar Forest (52), Shattrath City (9), Nagrand (17), Azuremyst Isle (3), Bloodmyst Isle (18), Scholomance (55), Zul'Gurub (11), The Deadmines (11), Stormwind City (26), Ghostlands (23), Eversong Woods (2), Scarlet Monastery (10), Mana-Tombs (4), Tirisfal Glades (77), Western Plaguelands (10), Undercity (2), Karazhan (42), Dire Maul (38) and Sunken Temple (1).