The species is breeding at only a small number of sites, with about 65% of the population within 5 km range of release centres which provide the birds breeding opportunities as well as additional food. Recently, decreasing efforts in these centres have stimulated White Storks to disperse more widely. Since the start of the re-introduction project in 1969, a marked increase has been reported, from 5-9 bp in 1974-77 to 330, 380 and 396 bp in 1998-2000, respectively. Although still partly dependent upon additional food, the offspring of released birds shows regular migration movements.
- 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.