Thai National Parks

Birds of Thailand

Species of Thailand

Grey-rumped treeswift

Thai: นกแอ่นฟ้าตะโพกสีเทา, nok aen faa taphok see thao

Binomial name: Hemiprocne longipennis, Constantine Samuel Rafinesque-Schmaltz, 1802

The grey-rumped treeswift (Hemiprocne longipennis) is a species of bird in the Hemiprocnidae family. There are currently four extant species in the family. Like the other members of Hemiprocnidae, this species is closely related to true swifts as well. However, unlike true swifts, the treeswifts are arboreal in nature, often seen perched on trees, high tension power transmission lines and on pylons. When perched, the wing tips cross over the tail. This species is commonly found in peninsular Malaysia but has an extremely large range with limited information about the population trend, .


Adult male with a distinct dark grey throat and chest contrasting with a white belly.Ear coverts are dull orange red/chestnut colored. Adult female lacks the dull orange red/chestnut coloration on the ear coverts. When perched the wing tips cross over across the tail. Both sexes have a greenish sheen to the upper parts.


It is found in Brunei, Indonesia, Malaysia, Myanmar, the Philippines, Singapore, and Thailand.

Its natural habitats are subtropical or tropical moist lowland forests, subtropical or tropical mangrove forests, and subtropical or tropical moist montane forests

Ecology and Behaviour

The birds occasionally catch insects in flight by sallying from perches. They build nests on tree branches. The half-saucer shaped nest is made from hardened saliva interspersed with feathers, mosses and/ or flakes of tree bark. The single egg is reportedly attached to nest surface with saliva. Owing to the fragile nature of the nest, it is attached only one one side to the branch. Thus, the bird does not sit directly on the nest for incubation. Similarly, it is also reported that the parent birds brooded by perching on the branch above the nest and fluffing their breast feathers out to cover it.

Both sexes help incubate the egg. During the shifting of parental care, the partner perches near the incubating adult and carefully slides over the nest.

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Scientific classification

Hemiprocne longipennis

Common names

  • Thai: นกแอ่นฟ้าตะโพกสีเทา, nok aen faa taphok see thao

Conservation status

Least Concern (IUCN3.1)

Least Concern (IUCN3.1)

Distribution map of Grey-rumped treeswift, Hemiprocne longipennis in Thailand
  • Ao Phang-Nga National Park
  • Bang Lang National Park
  • Hala-Bala Wildlife Sanctuary
  • Hat Noppharat Thara - Mu Ko Phi Phi National Park
  • Kaeng Krachan District, Phetchaburi
  • Kaeng Krachan National Park
  • Khao Banthad Wildlife Sanctuary
  • Khao Chong
  • Khao Lak - Lam Ru National Park
  • Khao Luang National Park
  • Khao Nam Khang National Park
  • Khao Nan National Park
  • Khao Phanom Bencha National Park
  • Khao Phra - Bang Khram Wildlife Sanctuary
  • Khao Sok National Park
  • Khlong Nakha Wildlife Sanctuary
  • Khura Buri District, Phang Nga
  • Kromluang Chumphon Wildlife Sanctuary
  • Kui Buri National Park
  • Mu Ko Lanta National Park
  • Mueang Krabi District, Krabi
  • Mueang Phang Nga District, Phang Nga
  • Mueang Phetchaburi District, Phetchaburi
  • Mueang Phuket District, Phuket
  • San Kala Khiri National Park
  • Sirinat National Park
  • Sri Phang-nga National Park
  • Sukhirin District, Narathiwat
  • Tai Rom Yen National Park
  • Takua Pa District, Phang Nga
  • Tha Chana District, Surat Thani
  • Thalang District, Phuket
  • Thale Ban National Park
  • Ton Nga-Chang Wildlife Sanctuary
  • Ton Pariwat Wildlife Sanctuary
  • Yan Ta Khao District, Trang

Range map of Hemiprocne longipennis in Thailand

Important note; our range maps are based on limited data we have collected. The data is not necessarily accurate or complete.

Special thanks to Ton Smits, Parinya Pawangkhanant, Ian Dugdale and many others for their contribution for range data.

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