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The Medusa (Aerocnidaria aerae) is a huge aerial lifeform native to the moon Eywa. The native Na'vi known them as Fpxafaw or Lonataya. Their anatomy consist of a large bell-shaped sac filled with hydrogen, up to 15 meters in diameter; and a mass of tentacles which can be over 35 meters long which produce electric shocks strong enough to kill or paralyze most kinds of prey.

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