zeta_metroid
The third stage of evolution of a metroid (creature). Compared to it's previous stages, this one has developed a full body, bearing similarity to xenomorphs- except more reptilian in movement and appearance.
See also
•• Metroid larva•• Alpha metroid
•• Gamma metroid
•• Zeta metroid (you are here)
•• Omega metroid
•• Queen metroid •• Metroid: Samus Returns