Data Zone
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.
| Critically Endangered | Endangered | Vulnerable |
|---|---|---|
| - | - | D1 |
| 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 |
| 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 | - |
| 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 | 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 |
| 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 |
| 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 |
| 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 | ||||||
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Recommended citation
BirdLife International (2023) Species factsheet: Apus acuticauda. Downloaded from
http://www.birdlife.org on 31/03/2023.
Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from
http://www.birdlife.org on 31/03/2023.
