Vulcans

Vulcans are alien species. They are very logical.

History
Vulcans was third (after Bohandi and Bird-Shaped colds) species contacted humans (does not count Greys, as most humans told that they not exist). T'pal was one of them. She comed during Agmat's revenge and sgtarted friendship with most of the Swallows and Amazons alliance members, especially Milosz. (About Agmat's revenge 3). Later, she joined Roger and rest in they voyages (Roger foresails hunter, etc). In one part of journey, they also encounted she's family. (Roger in land of lemurs).

Background
Vulcans are, in fact, species from Star Trek. Non-canon Works (and Troubles in journey, half-canon) stated that Stat Trek is a Parallel universe.