First thing is first, get to Dalaran and fly to Borean Tundra. The closest place for Horde is Warsong Hold and for the Alliance it is Valiance Keep. Next you want to fly or swim (if you prefer to make things difficult) to the Riplash Ruins. You will want to be at about 55,88 before you take a dive.
The entrance isn't all that easy to find without a group of people hanging out around the area, but this is what you're looking for. Between all that seaweed is a little cave you can swim down. Sure it will feel like you're swimming into a dead end, but trust me, it isn't!
Once at the end of the cave, swim up. You will now be in a little cavern. Follow the cavern to the back where you will see an altar. Behind the altar is a pile of bones with the White Murloc Egg nestled safety inside. Loot it and add it to your collection as normal.
|Ohhh, another pearl altar to add to the mystery!|
Congratulations, you are now the proud owner of your own little Terky! What did you think of this hidden mini pet? I personally loved it, and I'd love to see Blizzard add more hidden things like this in the future. Who knows what's already in there that we haven't discovered yet! Only time will tell what adventurers may stumble onto.