Specialist Groups are networks of expert scientists who provide information and advice in support of Wetlands International's programmes and projects in line with the organisation's strategy. The network of Specialist Groups is a vital part of Wetlands International, essential for the delivery of wetland and wetland species expertise in support of wetland conservation globally. There are currently 20 Specialist Groups: 14 covering waterbird taxa, five thematic groups on wetlands and wetland and waterbird issues, and one on freshwater fish. Overall, Wetlands International Specialist Groups network involves over 2,000 people. Waterbird Specialist Groups are operated as a 'Waterbird Network' jointly with IUCN-Species Survival Commission. This five year report covers the period 1999-2004 (inclusive), ofactivities by the respective specialist groups and it is aimed to inform people of the role the groups play in 'wetlands science and conservation'.