Magnitude and timing of migrant raptors in Central Java']Java, Indonesia

A study of visible migration of raptors through the Dieng Mountains, Central Java, Indonesia, was based on six sites perpendicular to the axis of migration. At least 30 000 raptors migrated through the area annually over an 8-week period in Sep-Nov. The migration mainly comprised Japanese Sparrowhawks Accipiter gularis (estimated total of 3500 individuals annually), Chinese Sparrowhawks A. soloensis (23 000), and Oriental Honey-buzzards Pernis ptilorhyncus (2500). For these three species, the central 75% of the population passed during a 2-4 week period (Japanese Sparrowhawk: 18d; Chinese Sparrowhawk: 14d; Oriental Honey-buzzard: 29d). The Dieng Mountains are one of less than ten sites in SE Asia where >10 000 raptors pass annually. Monitoring raptors at other sites along the Australasian migratory pathway would increase information about migration timing, species composition, and species-, age- and sex-specific patterns of East Asian raptors.