From Creatures Wikia
The Mimikry Norns were created by Sabine. They are available for Creatures 2 only and occupy Norn slot N. The female of the original pair is called Bienchen and the male is called Ralph. Their head colour changes depending on their mood (red = angry, green = fearful, bright = tired), and they have large ears and even diapers in the baby life stage. Mimikry Norns like to travel.