A furry, burrowing species from the world of Haya, the Hayator are large musteline carnivorous mammals with long, flexible spines. They were equally comfortable with traveling on all fours or upright. Most Hayator were infertile females. One in every hundred was male, and five in every hundred were fertile females. Hayator live in clans called "septs," always headed by a female. Septs were organized into dens, which were made up of sterile females and a small number of breeder males and females. Although they did possess advanced technology, they generally stayed on Haya.