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Fauna, meaning "animals", refers to distinct classes of animal seen in the BIONICLE storyline:

Generation 1

Set Orange Nui-Rama.png Rahi, the wildlife of the Matoran Universe; made from Protodermis and Viruses.

Set Sea Squid.png Creatures, the wildlife native to the planet of Spherus Magna; composed of organic tissue, and are based around a biological ecosystem.

Generation 2

Magazine SkullScorpion.PNG The wildlife native to the island of Okoto.