Ethology and Physiology
Scarabs tend to swarm in small rooms and narrow hallways, moving about in one inseparable mass. If they sense a hostile creature is near, they block the creature's path by embedding themselves onto walls, ceilings and floors. If the creature advances near embedded scarabs, they will explode violently. These creatures exhibit swarm behavior and swarm intelligence, acting as one although they are physically individual. Scarabs have no natural fear of death; finding strength in numbers, they are able to sacrifice themselves for the sake of the swarm. Individually, these creatures are nearly insignificant, showing a low-threat level in the radar and causing minimal damage to Samus; in large groups, however, they have no trouble exploding their way through an Energy Tank's worth of damage.
- "Exploding parasites that can embed their bodies in solid rock. Scarabs think nothing of sacrificing themselves for the safety of their swarm. When a hostile life-form is sighted, they block its progress by embedding themselves in floors and walls. Embedded Scarabs violently self-destruct when threatened." — Logbook "Scarab" (Metroid Prime)