From Creatures Wiki
All Creatures have Digital DNA and a working biochemistry. They also possess drives which guide their behavior depending on what they need (these serve as the human equivalent of 'feelings'). They can reproduce, resulting in the creation of children that contain genetic material from both parents. A major part of the Creatures series gameplay for many players consists of breeding creatures for desirable traits.
The species of Creatures are Norns, Ettins (introduced in Creatures 2) and Grendels. For each of these species, there are a number of breeds, both third-party and official, which have different sprites and/or different genomes.
Another lesser-known category of Creatures is the Geats, which is a catch-all for (generally third-party) breeds that do not fit into the standard categories. Examples of such unusual Creature species include GIL for C2 and Gaia for C3.
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