Western Jackdaw Corvus monedula, Hoofddorp, 30 November 2011 (Roy Slaterus): sound-recording

Short and cutting kya - usually repeated
Harmonics clearly visible; first harmonic louder than fundamental
First harmonic 1.3-3.0 kHz; 0.04-0.05 sec 
Average first harmonic 1.5-3.0 kHz; 0.05 sec (n=4)



Western Jackdaw Corvus monedula, IJmuiden, 23 December 2011 (Roy Slaterus): sound-recording

Another example of same call
Shape slightly different
First harmonic 1.7-3.1 kHz; 0.04 sec



Western Jackdaw Corvus monedula, Haarlem, 11 December 2011 (Roy Slaterus): sound-recording

Another example of same call
Shape slightly different
First harmonic 1.8-3.0 kHz; 0.08 sec 



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