The animals found in a particular area (5)
I believe the answer is:
fauna
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">the animals found in a particular area</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(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" .)