Infertile
From Creatures Wiki
Norns, Ettins, or Grendels that are unable to kiss-pop, or reproduce.
In Creatures 2, Ettins and Grendels were infertile by default and required a COB and genome update to make them breedable. In Creatures 3 they were fertile, but the only way to get a female Grendel or male Ettin was to splice existing members of the species.


