Birds of a region (8)
I believe the answer is:
avifauna
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">birds of a region</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for avifauna that I've seen before include "Bird collection" , "Flyers locally" , "Local birds" , "The birds of a particular region" .)