Sandiggers are tunneling creatures found in Agon Wastes on Aether. They have two heads, each capable of thinking separately. Their "dual-brain nervous system" and behavior seems to suggest that both brains share a body, but not a one thought process. This means that when one brain dies, the other continues controlling the body to fight.
Sandiggers will attack by either ramming their prey or by firing acidic fluid. Samus can only defeat Sandiggers when they mandibles are not blocking their head, though powerful weapons such as the Sonic Boom or Power Bombs can destroy Sandiggers at any time.
"Sandigger" is a simple combination of the words "sand" and "digger." The name is obviously earned due to the fact that Sandiggers dig through the ground.
- "Scans indicate that the Sandigger has a dual-brain nervous system. Both of its heads are capable of attacking, disabling, and digesting prey. It fires globs of acidic digestive fluid at prey to cripple them and begin the digestion process. Its hide is very durable and resistant to weapons fire: only its exposed eyes can be damaged." — Logbook "Sandigger" (Metroid Prime 2: Echoes)