Fauna or animal world refers to the entirety of all animals

Fauna or animal world refers to the totality of all animals in an area or, in the narrower sense, all animal species in this area. The associated science is biogeography.

If the entire planet Earth is considered, the fauna includes all animal species, for example in palaeontology, where one speaks of a “fauna of the Cretaceous period”. The name is derived from the name of the Roman goddess of nature, Fauna. The equivalent of fauna in the plant kingdom is flora.