Skeletal Companions: WoW Battle Pets

Sanctum Feature: Abomination Factory (tier 2)

Zone: Maldraxxus

Covenant: Necrolord

Abominable Stitching: [Backbone]

Cost: 750

Scenario: Island Expeditions

Approximate Drop Rate: Unknown

Quest: Critters of Draenor [1]

Zone: Lunarfall, Frostwall

Drop: Traveler's Pet Supplies

Approximate Drop Rate: 1 in 25

Drop: Lord Marrowgar [??+]

Zone: Icecrown Citadel

Approximate Drop Rate: Unknown

Scenario: Island Expeditions

Approximate Drop Rate: Unknown

Created From: Lend Me a Hand

Zone: Maldraxxus

Pet Battle: [25] The Maw

Drop: Conflagros [50+]

Zone: Darkshore Warfront

Approximate Drop Rate: Unknown

Profession: Archaeology - Fossil

Artifact: [Fossilized Hatchling]

Promotion: Wrath of the Lich King Collector's Edition

Vendor: Darahir

Zone: Dalaran (Northrend)

Cost: 40 (unlimited supply)

Trading Card Game: Worldbreaker

Pet Store 

World Event: Day of the Dead

Quest: The Grateful Dead [1]

Drop: Supplies of the Undying Army

Zone: Maldraxxus

Approximate Drop Rate: Unknown

Achievement: Pet Battle Challenge: Stratholme

Category: Pet Battles

Drop: Oonar's Arm

Zone: Maldraxxus

Drop Rate: 1 in 1

Drop: Nefarian [??+]

Zone: Blackwing Descent

Approximate Drop Rate: Unknown

Pet Battle: [25] Nazmir

Drop: Curious Wyrmtongue Cache

Zone: Broken Shore [45]

Approximate Drop Rate: Unknown

Drop: Spinebug

Zone: Maldraxxus [50-60]

Drop Rate: 1 in 1

Drop: Scunner [62+]

Zone: Maldraxxus

Approximate Drop Rate: Unknown