The genus Pteropus contains at least 60 species across South Asia, Southeast Asia, Australia, East Africa and Indian and Pacific island groups; single roosts of up to 100,000 individuals are recorded for some species, but no survey aggregates a total population across the whole genus.
What would resolve this A coordinated genus-wide census combining the separate national and island surveys already conducted for individual Pteropus species.
OpenChiropterology and conservation biologyPteropus (Wikipedia)