The CSN Tool has been jointly developed by Wetlands International, BirdLife International and the World Conservation Monitoring Centre (UNEP-WCMC) to deliver and map information on migratory waterbirds in the framework of the Wings Over Wetlands (WOW) Project. The tool combines and integrates information on BirdLife International's Important Bird Areas, Wetlands International's International Waterbird Census sites, Ramsar sites and other protected areas and includes data for all waterbird species in the AEWA region.