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It feeds small insects in flight. Forms small groups when foraging.
Swiftlets that nest in complete darkness in caves can use [[Animal echolocation|echolocation]], the ability to position an object by reflected sound, used by other animals such as dolphins and bats. Breeding season varies per island but usually within the window from May to September<ref>{{Cite journal |last1=Chantler |first1=Philip |last2=Boesman |first2=Peter F. D. |date=2020 |title=Pygmy Swiftlet (Collocalia troglodytes), version 1.0 |url=https://birdsoftheworld.org/bow/species/pygswi2/1.0/introduction |journal=Birds of the World |language=en |doi=10.2173/bow.pygswi2.01 |issn=2771-3105|url-access=subscription }}</ref>
== Habitat and conservation ==
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