Xindi

The Xindi was an alliance of species, composed of primates, arboreals, insectoids, reptilians, aquatics, and the extinct avians, who all evolved on the planet Xindus, located within the Delphic Expanse. The Xindi killed millions of humans by attacking Earth in 2153, per orders of an extra-dimensional organization hoping to prevent to formation of the United Federation of Planets.

In one alternate timeline, the Xindi had become a member of the Federation by the 26th century.