Asian Long-fingered Bat

The eastern bent-wing bat is a vesper bat in the bent-winged bat family, found in South Asia, Far East Asia, the eastern Caucasus and Southeast Asia. The colour varies from reddish brown to dark blackish brown above, with lighter underparts and blackish-brown wing membranes. The fur is dense and soft, long above and short below, the ears are small and the cheeks are hairless below the eyes (Wikipedia, general species account).

It has long, narrow wings with a high wingspan and low wing loading, which allow quick, long-distance flight. A 2018 study reported that echolocation frequencies were very similar among colonies, and that variation in calls was likely due to background noise rather than genetic drift.