A Metroid Cocoon is an artificial home for Infant Tallon Metroids in Metroid Prime 2: Echoes. They are exclusively seen in Biostorage Station hanging from the room's ceilings.
The scan of the cocoon implies they are not naturally produced by Metroids and are instead engineered by the Space Pirates to sustain and transport their supply of immature Tallon Metroids. In-game, they serve a similar function to Air Holes in which a limitless number of infants will continuously exit from the bottom opening, one after another whenever Samus is nearby. The cocoons have a very tough outer layer, requiring three charged Power Beam shots to destroy.
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Logbook entry[]
Metroid Cocoon
Morphology: Metroid Cocoon. Storage chamber for young Tallon Metroids. Biomass to support Tallon Metroid infants. Lacks armor or shielding.
The Space Pirates transport young Tallon Metroids in an organic "cocoon" designed to sustain the small creatures. Each cocoon can support numerous infants for several cycles. The creatures are normally content to remain in the cocoon, but will emerge when they detect the presence of Phazon.
Metroid Prime 2: Dark Echoes Q&A[]
QUESTION: The Pirate base in Agon [Wastes] has some Metroicoons, which look like praying mantis eggs. So where is the Metroid which laid those eggs? Metroids typically split via beta ray particles but surely don’t reproduce by laying eggs (only a Metroid Queen lays eggs). So is there perhaps a Queen Metroid on Aether? Is it possible that a Tallon Metroid, mutated by Phazon, can lay eggs?
ANSWER: The Metroid cocoons are chrysalides that were created in a Space Pirate experiment in which Tallon Metroids underwent metamorphosis. They are not eggs.[1]
Trivia[]
- The interview above implies that the cocoons are actually Tallon Metroids that transformed their bodies into organic homes, a result of Space Pirates experimenting on them.
- In Metroid Prime 3: Corruption, several unknown pulsating cocoons can be found near Phazon-corrupted Metroid Eggs on planet Phaaze. Because these cocoons are in close proximity to Metroids, these may also contain the creatures at a certain stage of development.