Caitian

Caitians are a fictional species first featured in Star Trek: The Animated Series (abbreviated as TAS). Modeled after African lions, Caitians stand bipedally on digitigrade feet. They also have excellent hearing and night vision, although their facial structure and vocal biology make it difficult to speak English properly. Their feline appearance includes a mane and tail which match their lion counterparts.
M'Ress, the Caitian officer in the series, remained popular for years after the end of the show, and was the unofficial inspiration of Freighter Tails and stories by Paul S. Gibbs. M'ress, with her cat-like voice patterns and her anthropomorphic features, represents one of the first "furry" characters shown on TV, one that was neither a person with cat ears nor a talking cat.
There are various data sources for this species available, although these sources were never considered canonical for the Star Trek universe and probably never will. There is still debate among fans on whether they are canon or not, as people claim the furry characters seen at the end of Star Trek IV: The Voyage Home were intended to be Caitians.

The Caitian race is unofficially related to the Kzinti (see also Wikipedia), though one of the few pieces of information relating to the species states that they are a Kzinti descendant. The Animated Series had one episode that also featured Kzinti as a separate species, The Slaver Weapon, written by Larry Niven based on an older work.
This crossover between Star Trek and Niven's Known Space is one of the reasons The Animated Series is non-canon: reconciling the two universes would make for messy bookkeeping, and would cause licensing issues. Furthermore, at the time that Paramount was introducing the new Star Trek Movie universe, they did not want to deal with the huge realm of loosely monitored associated properties; for simplicity, the word from above became that only live action Star Trek was canonical. [1] (Originally, some people at Paramount only wanted movie-era imagery and continuity to be the new official Star Trek, to have even tighter control, but this proved impossible.)A few furries who enjoy Star Trek are particularly fascinated by this race, and some even play a Caitian on any Trek MU* that has them. However, the Star Trek TV series have very few species with fur and in fact, only two movies featured such furred characters.


In June 2010, Caitians were added as a purchasable playable race in the Star Trek Online MMO web store. Their appearance was modeled after the Star Trek IV cat people, not the Animated Series version.
An alien feline race called "Caitians," inspired by but not intended to be identical with the Star Trek Animated Series version, is featured in the Chakona Space setting.