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Its natural [[habitat]] is subtropical or tropical moist lowland [[forest]]s. At under {{convert|9|cm|in|abbr=on}}, it is the world's smallest swift. It weighs only 5 grams.
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.{{citation needed|date=September 2021}}
==References==
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