No firm indications for breeding in 1998-2000, although longer staying and singing individuals were recorded at two sites. The species became extinct in the 1970s (last confirmed breeding record in 1974), but reappeared in 1995 with a successful pair in Noord-Brabant and 1-2 territorial individuals in subsequent years.
Diek, H. van
- SOVON Vogelonderzoek Nederland 2002. Atlas van de Nederlandse broedvogels 1998-2000. Nederlandse Fauna 5: 1-584. Nationaal Natuurhistorisch Museum Naturalis, KNNV Uitgeverij & European Invertebrate Survey-Nederland, Leiden.