- Cypsiurus balasiensis
13 cm (5 in). A small swift with extremely long and narrow wings.
- Body brownish, darkest on crown, rump slightly paler
- Wings thin and very long
- Long and narrow tail-streamers (often held folded)
- Juveniles are paler and have slightly shorter tail-streamers
Common and locally abundant. Not globally threatened.
Forms a superspecies with the African Palm Swift Cypsiurus parvus and was also formerly lumped with this species.
Four subspecies recognized
- C.b. balasiensis on the Indian Subcontinent west of Assam
- C.b. infumatus from Assam to Indochina, the Malay Peninsula, Sumatra and Borneo
- C.b. bartelsorum on Java and Bali
- C.b. pallidor on the Philippines
Occurs wherever fan and betelnut palms are present. Cities, towns, cultivated area, rarer in forested areas. Up to 1500m.
A resident species.
Feeds on insects, eg. flying ants, termites and beetles. Highly gregarious, often found in foraging in mixed flocks with Little Swifts.
Breeds all year round with local peaks. Nest built in palm fronds, sometimes in thatched roofs, usually small groups breeding together. The nest is a tiny half-cup, attached on three sides to palm leaves. The two eggs are not glued to nest as in African Palm Swift.
- Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2015. The eBird/Clements checklist of birds of the world: v2015, with updates to August 2015. Downloaded from http://www.birds.cornell.edu/clementschecklist/download/
- BirdForum Opus contributors. (2021) Asian Palm Swift. In: BirdForum, the forum for wild birds and birding. Retrieved 21 January 2021 from https://www.birdforum.net/wiki/Asian_Palm_Swift