The roach is a particularly tough, armored breed which possesses a high-speed regeneration ability when burrowed. This quick regeneration is due to the constant breakdown to the roachs's own modified pharynx, a natural byproduct of the zerg's acid production, an intentional design by the Swarm in order to facilitate quicker regrowth. A roach is slightly shorter than a terran wearing CMC armor.[3 In order to properly form, roaches require dark, humid conditions, such as those found in a roach warren