NDFF Survey of breeding birds (colonies and rare birds)

The counting areas were surveyed 3 times in the course of one season. No mapping was conducted of camp sites, recreational facilities, sports centres, horticultural areas, cemeteries or urban areas - with the exception of hamlets and linear settlements. This research project considered all species, but some were studied qualitatively and others quantitatively. Dataset available via https://www.ndff.nl/english / [e-mail] 95,695 records (March 2018) https://www.ndff.nl/overdendff/validatie/protocollen/14-203-landelijk-soortenonderzoek-broedvogels/