Phosphorescent Stone Drake
Find Aeonaxx, mount it and defeat it during a small event in Deepholm.  (Links to Sister Site)
Time-Lost Proto Drake
The elusive golden dragon, trying to find it's way through the mountains.   (Links to Sister Site)
Vitreous Stone Drake
Dropped by Slabhide, the second boss in Stonecore.
Drake of the North Wind
Dropped by Altarius, the second boss in Vortex Pinnacle.