The article that you searched for has multiple meanings or usages. The following is a list of those articles.
Fauna, meaning "animals", refers to distinct classes of animal seen in the BIONICLE storyline:
|Rahi, the wildlife of the Matoran Universe; made from Protodermis and Viruses.
|Creatures, the wildlife native to the planet of Spherus Magna; composed of organic tissue, and are based around a biological ecosystem.
|The wildlife native to the island of Okoto.