Cancuna's Comments

Everytime you kill an Ancient Spineclaw, there's a chance that a Monstrous Spineclaw will spawn on the island.  It can spawn in any of the Ancient Spineclaw spawn locations. Same mechanic works for the rares: Emerald Gander and Ironfur Steelhorn (they don't drop pets though)  and Imperial Python (does have a pet)

Everytime you kill a Death Adder, there's a chance that an Imperial Python will spawn on the island.  It can spawn in any of the Death Adder spawn locations. Same mechanic works for the rares: Emerald Gander and Ironfur Steelhorn (they don't drop pets)  and Monstrous Spineclaw (does have a pet).

As of 5.1, the moth is now working.  I had to release and recapture, but got credit and the achievement today.

As of 5.1, this guy's needed for the achievement.  Eventhough I had one, it was not recognized in the achievement list.  I set him free and captured a new one, earned the achievement.

I didn't see anyone mention this, but be mindful of the cross-realm status.  Midnight local time might not be midnight server time, and it's the server time that matters.  Had to wait until 3 AM local to try for my Shadeling.  Good luck!

For some reason, Deadwind Pass is "cross-realmed" but I fly over the hill to STV and server and local time match.  le sigh.