Meaning

noun all the animal life in a particular region or period

noun a living organism characterized by voluntary movement

originBorrowed from New Latin fauna, from Latin Fauna, sister of Faunus (“god of forests and herdsmen”); akin to Ancient Greek θαῦνον (thaûnon, “wild animal, beast”), θώς (thṓs, “jackal, wild dog; panther”), Phrygian δάος (dáos, “wolf”).

Etymology from Wiktionary, CC BY-SA 3.0