The Xindi were an alliance of species who evolved on the same planet in the Delphic Expanse, known as Xindus, whose infamous attack on Earth and attempts to eradicate Humans in the early 2150s changed the course of history and initiated the series of events that helped establish United Earth as a major interstellar power. Earth encountered the Xindi again when the borg attacked their worlds. 11 Billion Xindi managed to escape.
Six different intelligent species developed on Xindus; one of them, the Xindi-Avians, was believed extinct by the 2150s. The surviving species were united under the governance of the Xindi Council, which contained two representatives from each species.