Description
It is 11 to 12 cm long and weighs 15 to 18 grams. The plumage is blackish-brown above, paler on the underparts. The rump is slightly paler than the rest of the upperparts. The tail is slightly forked and the wings are long and narrow. The bill and feet are black.
The subspecies A. f. micans is paler and greyer while A. f. vestitus is darker with a rump that is less obviously paler.
Several calls are uttered including a loud, rattling call used for echolocation in dark caves.
Read more about this topic: Edible-nest Swiftlet
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