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This second volume of the Global Register of Migratory Species complements the reference list of migratory vertebrate species with fishes and songbirds, in printed and digital format. The enclosed GROMS CD contains an improved and updated version of the GROMS database, including 5,600 references, full-text documents and 1,000 species distribution maps in GIS format. These are complemented by additional, relevant geodata sets such as country files, protected wetlands or oil spills. The user guide empowers novices to make simple database searches, and customize their own maps with the enclosed lightweight GIS freeware. Advanced users will find the full tutorial of a GROMS Workshop for Power Users on CD, with examples of advanced data-mining and GIS intersections, to enable pursuit of their own research questions related to migratory species conservation. This volume presents examples of what can be achieved by combining GROMS with other species databases or regional GIS datasets, thereby zooming in from global to regional scales. Up to now, 4,358 species have been identified as definitely or most probably migratory, exhibiting predictable and cyclical migrations of more than 100 km, including 1,895 migratory fish species. Both volumes together illustrate the particular requirements of an information system serving the conservation of migratory species.