Unggoy (Earth-2042)

"When in doubt, flee."

- Unggoy philosophy

The Unggoy are a sentient species of squat bipedal arthropods from the ice  planet Balaho. In 22142 BBY, the Unggoy became the fourth species to be assimilated into the Covenant. During their tenure in the hegemony, Unggoy were always the lowest-ranking species in general terms, and were frequently mistreated by members of almost every other race, especially the Kig-Yar, Jiralhanae, and Sangheili. Unggoy were primarily used by the Covenant and the Confederacy of Independent Systems as laborers or—in combat situations—cannon fodder. They are commonly referred to as "Grunts", mainly because they are considered weak compared to other former Covenant species and because they performed the majority of the labor required by the empire.

Source

 * https://www.halopedia.org/Unggoy