Scientific Name: Hemiprocne longipennis
Malay Name: Layang-layang Berjambul Pinggul Pudar
Chinese Name: 灰腰凤头雨燕
Found from Southern Thailand, Malaysia, Singapore to Indonesia.
Polytypic. Subspecies are: harterti, perlonga, longipennis, wallacii.
Local Subspecies: harterti
Size: 18-21.5 cm
A rather big swift-like bird with dark glossy greenish crown, nape and mantle, blackish lores, greyish throat, whitish underparts. Tail-tip falls short of primary wing tips when perched. In flight, greyish back and rump contrast with dark mantle and has contrasting blackish underwing coverts. Male has chestnut ear-coverts while female has blackish ear-coverts.
Habitat: Open habitat, parkland and forested area.
Behaviour/Ecology: Feed on small insects taken in flight. Usually perch high up on tree.
Local Status: Uncommon resident
Conservation Status: Least Concern (BirdLife International 2016)
Location: Central Catchment Forest, Bukit Timah Nature Reserve, Bukit Batok Nature Park, Bidadari, Singapore Botanic Gardens, Kent Ridge Park and Bishan Park.
Conservation Status: IUCN Red List Page
Photos: Oriental Bird Images
Sound Recordings: xeno-canto Link
Wikipedia Entry: Wikipedia Link
eBird Species page: eBird (Gray-rumped Treeswift)
BirdLife International. (2016). Hemiprocne longipennis. The IUCN Red List of Threatened Species 2016. https://dx.doi.org/10.2305/IUCN.UK.2016-3.RLTS.T22686894A93129985.en. Accessed on 19 December 2021
Robson, C. (2014). Field guide to the birds of South-East Asia (Second Edition). Bloomsbury Publishing, London.