Influx van Blauwe Kiekendieven Circus cyaneus in het noordelijk deltagebied in de winter van 1995/96

Migrating and wintering raptors are being counted systematically in the northern Delta since 1965. in winter 1995/96, the mean number of Hen Harriers observed during field trips was the highest recorded in thirty years. Between 1 September 1995 and 1 April 1996, a total of 94 Hen Harriers was counted, giving an average of 2.2 birds per field trip Many Hen Harriers arrived in the Delta area after early December, when winter conditions deteriorated The Delta area has a relatively mild climate as compared to the rest of the country