New wolf howl sound effect (CC BY 3.0) by y89312...

Source: https://freesound.org/people/y89312/sounds/139901/

data/conf/creatures/animal.xml

@@ -735,6 +735,7 @@
     <ai>
       <says>
         <noise state="idle follow fight" value="Aooooooouuhhh!!"/>
+        <sound value="wolf-howl-01"/>
       </says>
       <profile name="animal"/>
       <profile name="offensive"/>
@@ -1066,6 +1067,7 @@
     <ai>
       <says>
         <noise state="idle follow fight" value="Aooooooouuhhh!!"/>
+        <sound value="wolf-howl-01"/>
       </says>
       <profile name="animal"/>
       <profile name="offensive"/>

doc/CHANGES.txt

@@ -13,6 +13,7 @@ Changelog
   - bear & black bear
   - chicken & mother hen
   - snake & grass snake
+  - wolf & big bad wolf
 
 
 1.31

doc/sources/audio-sfx.txt

@@ -117,5 +117,6 @@ undead-5.*                ArriGD; CC0; http://www.freesound.org/people/ArriGD/so
 water-faucet-1.*          unnamed; public domain; http://www.pdsounds.org/sounds/faucet_water_into_sink
 wings-flap-large-1.*      dave.des; CC0; http://freesound.org/people/dave.des/sounds/127197/
 witch-cackle-1.ogg        Jordan Irwin (AntumDeluge); CC0; https://opengameart.org/node/81248
+wolf-howl-01.*            y89312; CC BY 3.0; https://freesound.org/people/y89312/sounds/139901/
 xylophone-1.*             Storyteller; GPL
 yay-1.ogg                 Katie Russell (kymara); GPL