• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2022	Least Concern
2016	Least Concern
2012	Least Concern
2009	Least Concern
2008	Least Concern
2004	Least Concern
2000	Lower Risk/Least Concern
1994	Lower Risk/Least Concern
1988	Lower Risk/Least Concern

Migratory status	not a migrant	Forest dependency	medium
Land mass type		Average mass	-

	Estimate	Data quality
Extent of Occurrence breeding/resident (km2)	5,470,000	medium
Number of locations		-
Severely Fragmented		-

	Value	Data quality	Derivation	Year of estimate
No. of mature individuals	unknown	not applicable	not applicable	0
Population trend	decreasing		suspected	-
Decline (3 years/1 generation past)		-	-	-
Decline (5 years/1 generation past)		-	-	-
Decline (10 years/1 generation past)		-	-	-
Decline (10 years/3 generation future)	10-19	-	-	-
Decline (10 years/3 generation past and future)	10-19	-	-	-
Number of subpopulations		-	-	-
Percentage in largest subpopulation		-	-	-
Generation length (yrs)	3.8	-	-	-

Population justification: The global population size has not been quantified, but the species is reported to be common throughout most of its range (del Hoyo et al. 1999).

Trend justification: The population trend has not been quantified directly. A remote sensing study found that tree cover within the range has been lost at a rate of up to 21% over three generations (11.5 years; Global Forest Watch 2022, using Hansen et al. [2013] data and methods disclosed therein). As the species also occupies edge habitat, plantations and open woodland (Wells and Kirwan 2020), population declines are likely lower than the rate of tree cover loss. Nevertheless, hunting may contribute to local declines (Wells and Kirwan 2020). Therefore, the rate of population decline is here tentatively placed in the band 10-19% over three generations.

Country/Territory	Presence	Origin	Resident	Breeding	Non-breeding	Passage
Brunei	extant	native	yes
Indonesia	extant	native	yes
Malaysia	extant	native	yes
Myanmar	extant	native	yes
Philippines	extant	vagrant			yes
Singapore	extant	native	yes
Thailand	extant	native	yes

Country/Territory	IBA Name

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Plantations	suitable	resident
Forest	Subtropical/Tropical Mangrove Vegetation Above High Tide Level	suitable	resident
Forest	Subtropical/Tropical Moist Lowland	suitable	resident
Forest	Subtropical/Tropical Moist Montane	suitable	resident
Altitude	0 - 1880 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Biological resource use	Hunting & trapping terrestrial animals - Intentional use (species is the target)	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Species mortality
Biological resource use	Logging & wood harvesting - Unintentional effects: (large scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation, Ecosystem conversion

Purpose	Primary form used	Life stage used	Source	Scale	Level	Timing
Sport hunting/specimen collecting	-	-			non-trivial	recent

---

Recommended citation
BirdLife International (2023) Species factsheet: Hemiprocne longipennis. Downloaded from http://datazone.birdlife.org/species/factsheet/grey-rumped-treeswift-hemiprocne-longipennis on 31/05/2023. Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from http://datazone.birdlife.org on 31/05/2023.