The Collaborative International Dictionary of English v.0.48:

Fauna \Fau"na\, n. [NL.: cf. F. faune. See Faun.] (Zool.)
   The animals of any given area or epoch; as, the fauna of
   America; fossil fauna; recent fauna.
   [1913 Webster]

WordNet (r) 3.0 (2006):

fauna
    n 1: all the animal life in a particular region or period; "the
         fauna of China"; "the zoology of the Pliocene epoch" [syn:
         fauna, zoology] [ant: botany, flora, vegetation]
    2: a living organism characterized by voluntary movement [syn:
       animal, animate being, beast, brute, creature,
       fauna]

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "fauna":
   Animalia, and fish, animal kingdom, animal life, animality, beasts,
   beasts of field, beasts of prey, big game, birds, brute creation,
   cattle, domestic animals, furry creatures, game, livestock,
   small game, stock, wild animals, wildlife