The Volcano Swiftlet is a swiftlet of Java's high mountains. It is seen over volcanic craters and the surrounding montane forest.
Its upperparts are dark and its underparts paler, with a pale rump and a shallowly forked tail.
It forages over craters and surrounding montane forest and breeds in the craters of a handful of active volcanoes.
It gives high-pitched screams and clicking sounds.
It catches insects in flight while foraging in groups.
Males have unfeathered lower legs.
An extinction-risk assessment has not been added yet.