Rabbit
When you have two rabbits, you'll often soon have three.
This NPC can be found in
Feralas (32), Elwynn Forest (27), Mulgore (21), Azshara (21), Hillsbrad Foothills (16), Stonetalon Mountains (16), Darkshore (14), Stormwind City (10), Nagrand (9), Eversong Woods (9), Western Plaguelands (6), Blade's Edge Mountains (6), Moonglade (6), Coldridge Valley (5), Azuremyst Isle (5), Silvermoon City (5), Duskwood (4), Silverpine Forest (3), Howling Fjord (3), Redridge Mountains, Ammen Vale, Tirisfal Glades, Crystalsong Forest.