One of the most exciting changes for Patch 5.1 included the list of 12 new pet drops from old raid bosses. Collecting the set will reward you with the achievement and highly sought-after pet – Mr. Bigglesworth.

Blackwing Lair

Untamed Hatchling

Untamed Hatchling drops from Razorgore the Untamed

Death Talon Whelpguard

Death Talon Whelpguard drops from Broodlord Lashlayer

Chrominius

Chrominius drops from Chromaggus

Temple of Ahn’Qiraj

Mini Mindslayer

Mini Mindslayer drops from The Prophet Skeram

Viscidus Globule

Viscidus Globule drops from Viscidus

Anubisath Idol

Anubisath Idol drops from Emperor Vek’lor

Molten Core

Corefire Imp

Corefire Imp drops from Magmadar

Harbinger of Flame: Humanoid – Sulfuron Harbinger

Ashstone Core

Ashstone Core drops from Golemagg the Incinerator

Naxxramas

Fungal Abomination

Fungal Abomination drops from Loatheb

Giant Bone Spider drops from Maexxna

Giant Bone Spider drops from Maexxna

Stitched Pup

Stitched Pup drops from Gluth

Rewards

Mr. Bigglesworth