Drab Swiftlet Collocalia neglecta

A very small, square-tailed dark swift with a dirty white breast, belly, and base of the undertail. An aerial species, usually seen in flocks in flight over a variety of habitats, including forest. In its limited range within the eastern Lesser Sundas, it only overlaps with one other similar species, White-nest Swiftlet. Drab Swiftlet is smaller, lacking an obvious tail notch, and has white underparts.