Dark-rumped Swift Apus acuticauda


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.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - D1

Red List history
Year Category Criteria
2016 Vulnerable D1
2013 Vulnerable D1
2012 Vulnerable D1
2008 Vulnerable D1
2004 Vulnerable
2000 Vulnerable
1996 Vulnerable
1994 Vulnerable
1988 Threatened
Species attributes

Migratory status full migrant Forest dependency Medium
Land mass type Land-mass type - continent
Average mass -

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 158,000 medium
Extent of Occurrence non-breeding (km2) 6,500 medium
Number of locations 2-5 -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals 250-700 poor estimated 2000
Population trend Stable 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) - - -
Decline (10 years/3 generation past and future) - - -
Number of subpopulations 2-100 - - -
Percentage in largest subpopulation - - -
Generation length (yrs) 12.5 - - -

Population justification: The population is thought to lie within the range 250-999 individuals, based on estimates of breeding colony sizes ranging from a few to 200 individuals. This estimate roughly equates to 167-666 mature individuals, but the population is probably unlikely to be at the lowest end of this range. A provisional population estimate of 250-700 mature individuals is therefore given.

Trend justification: The population is suspected to be stable in the absence of evidence for any declines or substantial threats. This is supported by observations: records at its known sites have remained stable for many years, for example at Cherrapunji (J. Eaton in litt. 2013).

Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Bhutan N Extant Yes
India N Extant Yes
Nepal V Extant
Sri Lanka V Extant Yes
Thailand N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Bhutan Deothang / Narphang / Samdrup Jongkhar
Bhutan Tshangkha
Thailand Doi Inthanon
Thailand Doi Chiang Dao
Thailand Mae Fang
India Dzuku Valley
India Blue Mountain (Phawngpui) National Park
India Lengteng Wildlife Sanctuary
India Murlen National Park
India Khonoma Nature Conservation and Tragopan Sanctuary
India Puliebadze-Dzukou-Zapfu
India Cherapunjee: cliffs, gorges and sacred groves

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Lowland major breeding
Forest Subtropical/Tropical Moist Lowland major non-breeding
Forest Subtropical/Tropical Moist Montane suitable resident
Rocky areas (eg. inland cliffs, mountain peaks) major breeding
Rocky areas (eg. inland cliffs, mountain peaks) major non-breeding
Altitude 200 - 2470 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Biological resource use Logging & wood harvesting - Unintentional effects: (large scale) [harvest] Timing Scope Severity Impact
Ongoing Unknown Unknown Unknown
Ecosystem degradation

Recommended citation
BirdLife International (2023) Species factsheet: Apus acuticauda. Downloaded from on 31/03/2023. Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from on 31/03/2023.