Imitate the crow warning sound
This call is based on the Weisskirchen wild boar call. Only the internal parts were simplified and a very short piece of hose was attached as a mute.
Hold the crow call with your palm, blow slightly, and open and close your palm in turns so you can imitate the short and coarse crow warning sound – for example when the crow sees a fox.
If you remove the short piece of hose, the sound becomes sharper.