Klingon
- Appearance: Mammalian; dark skin, forehead crest, prominent spinal ridges, sharp incisors; on average taller, larger than humans
- QuchHa' minority resulting from modified Qu'vat virus look near-identical to humans
- QuchHa' population reached several million by 2165, but was treated and reverted to HemQuch majority by end of 23rd century (ENT Novel: Live by the Code; TOS Novel: Forged in Fire)
- QuchHa' minority resulting from modified Qu'vat virus look near-identical to humans
- Lifespan: over 150 years (DS9: "Blood Oath")
- Homeworld: Qo'noS
- Low tolerance for cold (DS9: "Change of Heart"; VOY: "Displaced")
- Magenta blood (Star Trek VI: The Undiscovered Country)
- Multiply redundant biological systems
- Two livers, three lungs, eight-chambered heart, redundant neural functions (TNG: "Ethics")
- Children mature quickly (cf. Alexander)
- Cultural notes
- Klingon calendar
- Klingon faith
- Klingon language
- Weapons
- Bat'leth (Various)
- Curved, two-pointed, pointed blade
- Bat'leth (Various)
- Foods and drinks
- qa'vIn (ENT Novel: Live by the Code)
- Import of Human coffee beans processed by Klingon agronomists to greatly enhance potency and concentration of caffeine (ENT Novel: Live by the Code)
- Raktajino (Various)
- Essentially Klingon coffee
- Derived from a blend of qa'vIn and ra'taj liquor, brewed as a cappucino
- qa'vIn (ENT Novel: Live by the Code)
History
- 2016: First contact with Vulcans, leading to decades of war (ENT Novel: A Choice of Futures; DIS: "The Vulcan Hello"; TNG: "First Contact")
- April 2151: First contact with Humans; Broken Bow, Earth incident (ENT: "Broken Bow")
- November 2154: Qu'vat virus leads to creation of QuchHa' minority class in contrast to HemQuch majority (ENT: "Affliction")
- Early 2290s: Cure discovered for Qu'vat virus; QuchHa' cease to exist. Their former existence is largely denied or kept quiet with outsiders from this point forward. (TOS Novel: Forged in Fire; DS9: "Trials and Tribble-ations")