Over het sjirpen van kiekendieven
De takkeling , Volume 25 - Issue 1 p. 67- 70
In a paper by R. Harold, an analysis and interpretation is given of the squeeling call of harriers at the roost. It was heard frequently, i.e. 122x between January 1985 and February 1987. In 96% of the cases it was heard during intraspecific antagonistic conflicts on the roost, mostly concerning juvenile Hen Harriers Circus cyaneus. In three cases, a Sparrowhawk Accipiter nisus was involved. The present author observed roosting Hen Harriers some 400 times in The Netherlands in the past decades. He also often heard the squeeling call, although the call would be described better as chirping rather than squeeling. In contrast to Harold, who identified the call as the aggressor’s, the present author only heard the call from the bird that was ‘threatened’ by the antagonist.
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