Lurky's Egg



Lurky's Egg teaches you how to summon Lurky, a baby murloc companion.

Source
This item was given to European players who purchased the Collector's Edition of The Burning Crusade and were unable to receive the Netherwhelp pet that was advertised to come with it. Since these players would need to mail in proof of their purchase to get the Netherwhelp, Blizzard added in Lurky's Egg and two days of game time as compensation for the inconvenience.

As of Legion, Lurky's Egg has been removed from the process, as it was only meant to be a temporary offer. When claiming the Netherwhelp's Collar, players will no longer receive Lurky's Egg.

Pet Journal
Lurky's charming disposition and lively antics are guaranteed to soothe frustration and lighten even the darkest moods.