Infant Tallon Metroid
Used by the Space Pirates as portable energy sources, these small creatures are relatively harmless and easy to transport in large numbers via organic "cocoons" designed to sustain them. However, the infants will emerge from their cocoons if they detect Phazon nearby; exposure to Phazon causes them to rapidly rapidly mature into deadly adult Tallon Metroids.
- "The Space Pirates use Infant Tallon Metroids as a portable energy source. Small in size, they are easy to transport in large quantities. They are docile efficient organic batteries... until they are exposed to Phazon. At that point, they grow rapidly and acquire their full array of powers." — Logbook "Infant Tallon Metroid" (Metroid Prime 2: Echoes)