The Mercury Norns were created by Bio Storm and can be downloaded at Cave of Creatures. The male and female norns look alike. The Mercury Norns occupy Geat breed slot A.
Since the same slot is used by the C3 Butterfly Norns which appeared in 2005, Alien converted the sprites to Ettin breed slot H in the action Pimp my Breed and added a new set of female sprites which now differ from the male ones. The new version of the Mercury Norns can be downloaded at Alien's Creatures World.