Efrosian
- Appearance: Mammalian
- Homeworld: Efros Delta
- Biological notes
- Originally evolved in slim temperate band around equator of Efros Delta (TTN Novel: Taking Wing)
- Maintenance of good health relies on nutrients found only in levithi nuts (TTN Novel: Taking Wing)
- Lack of essential oils produced by these nuts results in nausea, space sickness (TTN Novel: Taking Wing)
- Replicated nuts unable to provide suitable replacement by late 2379 due to complexity of organic molecules involved (TTN Novel: Taking Wing)
- Cultural notes
- Efrosian language
- Much longer history before reaching spacefaring age than most humanoid species due to difficult environmental conditions resulting from severe ice age throughout development (TTN Novel: Taking Wing)
- Strong oral tradition species-wide of full cultural history (TTN Novel: Taking Wing)
- Tradition developed due to environmental conditions leading to unreliable physical recording of information from generation to generation (TTN Novel: Taking Wing)
- Electronic data storage continued to be largely aural rather than optical even into the present day as a result (TTN Novel: Taking Wing)
- Generally sexually open, with monogamy a rare phenomenon (TTN Novel: Taking Wing)