The sixth article in the series on trends in Namibian waterbird populations summarises count data for African Spoonbill, Hamerkop, Greater and Lesser Flamingo and Wattled Crane for the period 1977 to December 2008. For each species the Red Data Book (RDB) status, both global and Namibian, is given, the population trend as per Wetlands International, the number of times the species was counted, the number of times it has passed the 1% population criterion, the maximum count and the sites where it has passed the 1% population criterion.