Kiru Giru

Kiru Giru (or Imago Larva) is the fifth boss Samus Aran faces in Metroid: Zero Mission on planet Zebes. Not many tend to notice, but this boss battle consists of saving the larva that's ensnared and getting slowly devoured by what seems to be carnivorous vines, as Samus witnessed many other creatures being consumed by similar looking vine-like plants before entering this chamber. To defeat it, Samus must freeze a winged Ripper, jump on it, and shoot the vines that are holding the larva with Missiles. Spores were constantly being launched from the larva, perhaps a result of interior decay caused by the vines, or from a reaction due to the vines themselves. As Samus destroyed the vines, the larva slowly changed from grey to its natural colors (possibly because the vines were absorbing its blood). When defeated, the larva itself will fall through the floor where it later forms a cocoon and grows into an adult Imago.

Samus also encounters two other larvae that roam free before the one hanging from the ceiling. They have vulnerable undersides, which Samus can damage either by shooting through the ceiling with the Wave Beam or planting Bombs in their path. Interesting to note is that after killing these two Imago Larvae, Samus sees a third one before fighting the one mentioned above, although this one appears to be dead and is pierced by two vine-like appendages, which at least seem to be consuming the larva's body from within.