The animals found in a particular area (5)
I believe the answer is:
fauna
'the animals found in a particular area' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for fauna that I've seen before include "Region's animals" , "Animal kingdom" , "Animals of an area or period" , "Wild animal life of an era" , "Animals of a particular region" .)