Hold the birdcall between thumb and index so that the rest of the hand can be used to make a loud hailer. This birdcall works on the in-breath. Start by short breaths as if calling for attention" pui pui pui ". Repeat three or four times successively. Then continue with longer stanzas, modulating the sound by varying the strength of the breath. As in all the "Turdus" family the Ring Ouzel has a melodious song, it's up to you to try and equal him.