gamma_metroid
The second stage of evolution of a metroid (creature). This one bears much likeness to it's previous stage, but has grown legs, extra eyes, and gained some kind of energy discharge it utilizes in combat.
See also
•• Metroid larva•• Alpha metroid
•• Gamma metroid (you are here)
•• Zeta metroid
•• Omega metroid
•• Queen metroid •• Metroid: Samus Returns