Chykka

Chykka were a species of massive butterflies that lived in Dark Torvus on Dark Aether. Chykka were born as Cykklings, and eventually matured into pupae. They eventually hatched as Chykka Larvae, then would cocoon themselves once more and finally transform into the Chykka Adult. If Chykka fell in the poisonous water on Dark Aether they would turn into the Dark Chykka, an even more dangerous form. A Chykka is fought in Metroid Prime 2: Echoes as the Guardian of Dark Torvus Temple. Defeating it earns Samus the Dark Visor. It seems Chyyka are hermaphrodites.

In Samus's battle with Chykka, she must first free the Chykka Pupa from a wall, which then hatches into a rather dim-witted Chykka Larva. The Larva will swim around Samus' platform, disturbing Dark Shredders whom Samus can destroy (and are mainly there for power-ups like Energy and such). The Chykka will eventually dive down, then burst up, crash into the water, and send shockwaves at Samus, much like the Jump Guardian, but on a larger scale. This is the time to damage Chykka. If Chykka's shockwaves get Samus, she will be pushed into the poisonous water. The Larva will sometimes leap into Samus' platform, trying to eat her. Samus must dodge the tongue and damage the Larva with beam weapons, as only those will work.

Once Chykka is hurt enough, it will collapse and the water will slowly drain lower. Chykka will then quickly metamorphsize into the Chykka adult, who splits the platform into three pieces, each with a Light Crystal. Samus must then stun Chykka with Beam weapons, grapple behind it, and damage its four weak spots on its back with missiles. Seeker Missiles will also work.

Once all of Chykka's wings are damaged, it will fall into the water and turn into the Dark Chykka. It will blast Chykklings at Samus, and Samus must damage its abdomen. After some time the "dark" affect will go away, and Samus must repeat the process. After dying fully, the door to Dark Torvus Temple will open, and Samus can transfer the energy back to Torvus Bog on Aether.