From Creatures Wikia
The Hand Norn is a genetic breed for Creatures 1 created by Gaz. They are physically based on the White Haired Pixie Norns and the Brown Mouse Norns, but the females have a red tint, and the males have a green tint.
I have based these on Chris from Lis Morris' books. Chris in these stories had a mutated gene that made him care about other Norns (Hence the name 'Hand' Norn). Unlike the stories, Annie here has the new genes too. They share everything with other Norns, and rarely leave if there is a creature in danger.