|TechStatus||Star Trek Canon|
The Trill are a humanoid species native to the planet Trill. Most notable about the species is their ability to physiologically join with a 'symbiont'. A small percentage of the Trill population co-exists with a sentient symbiotic organism known as a symbiont inside their bodies. The resulting joined Trill have personalities which are a synthesis of the two beings including the memories, and to some extent the personalities, of the previous hosts of the symbiont. This way, the joined being gains all the skills and occupations of the previous hosts.
Having had warp trade since antiquity, the Trill people are master scientists and lead the Federation in exploratory research and development. The products of their own research endeavors were kept hidden from the rest of the galaxy for quite some time, as the Trill people preferred not to relate with other cultures beyond necessity. As late as 2367, the fact that some Trill exist as a joined symbiotic species was widely unknown, even to Federation scientists.
The Trill people also enjoy extreme sports, in an unusual dynamic with their intellectual prowess. This is most likely the reason there are a great number of adept pilots among the population. Many Helm officers in Starfleet are Trill, joined or otherwise.