Though mostly encountered in subordinate positions within the Covenant hierarchy, Unggoy are intelligent, having been industrialized before their induction into the Covenant. The novels ' and ' describe the Unggoy as dog-like methane-breathers. They are stocky, possessing both an arthropod-like exoskeleton and a spinal-based nervous system. Their powerful forearms evolved for climbing vertical terrain. Unggoy have methane suits that allow them to remove the breathing apparatuses they usually wear to sustain them in non-methane atmospheres. In "", it is possible for the player to kill Unggoy in a way that ignites the methane tank, causing them to fly and bounce around the area out of control, and causing damage if they hit the player. smaller than a spartan same size as an unsc soldier