The International Waterbird Census (IWC) is a site-based counting scheme for monitoring waterbird numbers, organized since 1967 by Wetlands International, formerly the International Waterfowl and Wetlands Research Bureau (IWRB). The Census operates at a global level, and the former division into four separate continental-scale surveys was superseded in 2003 by a new strategy for global coordination. On 11-12th January, AOS in cooperation with other environmental organizations, experts, and the National Agency of Protected Areas will organize IWC 2020.