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The Xindi are a fictional race from Star Trek. They are best known for an unprovoked attack on Earth in April of 2153 that killed 7 million people between Florida and Venezuela. They are native to a region of space known as the Delphic Expanse.
The Xindi are unique in that the "race" is comprised of five (once six) distinct species. These share the same genetic origins but have developed along very distinct lines; aquatics, avians, insectoids, primates, reptilians, and sloths. The Xindi terms for their species have not yet been revealed. All Xindi, regardless of species, share characteristic ridges on their cheekbones.
Various Xindi were involved in a war lasting about 100 years (2049-2149) that ended with the destruction of the Xindi-Avian race. The Insectoids and Reptilians were responsible for this when they planeted explosives that destroyed the Xindi Homeworld. The Avians couldn't escape because they had only primitive technology and so were forced into extinction. The Xindi, after the war, scattered throughout the Expanse into several colonies, where they are as of today.
The Xindi appear to be pawns in the Temporal Cold War, as they were supposedly informed around 2152 that they would be victims of a devastating attack from humanity in the 26th Century. The Xindi council, in response to the information it was told, launched a premptive strike on Earth as a precursor to a genocidal second attack. The Xindi spent the early part of 2153 deciding how to confront the threat of Humanity and planned a biological weapon based on the Human genetic profile. This failed and so they decided to form a weapon to blow up Earth. This weapon's power was seen in the Enterprise alternate reality episode "Twlight", when the weapon destroyed Earth and sent humanity (what was left of it) to different parts of space. However, this only happened because of Archer getting parasites and so when this was corrected, the old timeline was restored and he remained in control of Enterprise. What the result of that change has on the timeline remains to be seen...
Most intelligent of the five Xindi races. Degra, a Xindi-Humanoid, was assigned to develop weapon.
Run kemocite-production facilites throughout the Delphic Expanse. Gralik, a Xindi-Sloth, gave Degra an insufficient product of kemocite, which may just slow down the production of the weapon.
Xindi Species
Xindi-Aquatics
Not much else is known about this race other then that they swim underwater and speak through echolocation.Xindi-Avians
Thought to be extinct since the Reptilians and Insectoids planted explosives that destroyed the Xindi Homeworld. The Avians, having primative technology, couldn't leave the planet and so were wiped out.Xindi-Insectoids
Resemble six-foot ants. Speak in a clicking language unique to all Xindi. They exist in an alliance with the Reptilians and with them destroyed the Xindi Homeworld after the Hundered-Year War.Xindi-Humanoids (Primates)
Xindi-Reptilians
These are responsible for a failed bio attack on Earth in the early 21st Century. They use weapons with regenerative biological power cells. They are the most aggresive race of Xindi and seem to be more intrested then the other races in destroying Earth. Like the Insectoids, they are responsible for the destruction of the Xindi Homeworld.Xindi-Sloths

