Taxonomic note
Rhyticeros subruficollis (del Hoyo and Collar 2014) was previously placed in the genus Aceros.
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 |
---|---|---|
- | - | A2cd+3cd+4cd |
Year | Category | Criteria |
---|---|---|
2016 | Vulnerable | A2cd+3cd+4cd |
2012 | Vulnerable | A2cd+3cd+4cd |
2008 | Vulnerable | A2c,d; A3c,d; A4c,d |
2004 | Vulnerable | |
2000 | Vulnerable | |
1996 | Vulnerable | |
1994 | Vulnerable | |
1988 | Threatened |
Migratory status | not a migrant | Forest dependency | high |
Land-mass type |
continent |
Average mass | - |
Estimate | Data quality | |
---|---|---|
Extent of Occurrence (breeding/resident) | 360,000 km2 | medium |
Number of locations | 11-100 | - |
Severely fragmented? | no | - |
Estimate | Data quality | Derivation | Year of estimate | |
---|---|---|---|---|
Population size | 1500-7000 mature individuals | medium | estimated | 2000 |
Population trend | decreasing | poor | suspected | 1998-2045 |
Rate of change over the past 10 years/3 generations (longer of the two periods) | 30-49% | - | - | - |
Rate of change over the future 10 years/3 generations (longer of the two periods) | 30-49% | - | - | - |
Rate of change over the past & future 10 years/3 generations (longer of the two periods) | 30-49% | - | - | - |
Generation length | 19 years | - | - | - |
Number of subpopulations | 2-100 | - | - | - |
Percentage of mature individuals in largest subpopulation | 1-89% | - | - | - |
Population justification: A population estimate of 2,500-9,999 individuals has been derived from analyses of records and surveys by BirdLife International (2001). This equates to 1,667-6,666 mature individuals, rounded here to 1,500-7,000 mature individuals. At least 1,000 are known from Thailand as well as strong population centres in northern Peninsula Malaysia and southern Myanmar. Regular monitoring has been conducted at Pos Chiong/Kg Tebang in Temengor Forest Reserve, Peninsular Malaysia since 2004. Numbers fluctuate greatly from year to year, with the highest count on a single occasion of 3,261 on 14 September 2008 (Yeap and Ong 2011). Subsequent counts have been much lower (less than 1,000 individuals) (C. A Yeap in litt. 2012). Despite counts in previous years of between 2,500-3,000 individuals, less than 100 birds were counted in Perak, Malaysia in 2009 (F. Lambert in litt. 2009). A roosting flock of between 700-900 individuals has been recorded at Bang Lang National Park in Yala Province, Thailand (P. Poonswad in litt. 2012).
Trend justification: Hunting, trapping and deforestation are suspected to be causing rapid population declines.
Country/Territory | Presence | Origin | Resident | Breeding visitor | Non-breeding visitor | Passage migrant |
---|---|---|---|---|---|---|
Malaysia | extant | native | yes | |||
Myanmar | extant | native | yes | |||
Thailand | extant | native | yes |
Country/Territory | IBA Name |
---|---|
Malaysia | Belum-Temenggor |
Malaysia | Ulu Muda |
Myanmar | Chaungmon-Wachaung |
Myanmar | Karathuri |
Myanmar | Lampi Island |
Myanmar | Ngawun (Lenya extension) |
Myanmar | Pachan |
Thailand | Bala Sector, Hala-Bala Wildlife Sanctuary |
Thailand | Hala Sector, Hala-Bala Wildlife Sanctuary and Bang Lang National Park |
Thailand | Huai Kha Khaeng |
Thailand | Kaeng Krachan |
Thailand | Khao Laem |
Thailand | Khao Nor Chuchi |
Thailand | Thung Yai - Naresuan |
Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
---|---|---|---|
Forest | Subtropical/Tropical Moist Lowland | major | resident |
Altitude | 0 - 1000 m | Occasional altitudinal limits |
Threat (level 1) | Threat (level 2) | Impact and Stresses | |||||||
---|---|---|---|---|---|---|---|---|---|
Agriculture & aquaculture | Annual & perennial non-timber crops - Agro-industry farming | Timing | Scope | Severity | Impact | ||||
Ongoing | Minority (<50%) | Slow, Significant Declines | Low Impact: 5 | ||||||
|
|||||||||
Agriculture & aquaculture | Annual & perennial non-timber crops - Small-holder farming | Timing | Scope | Severity | Impact | ||||
Ongoing | Minority (<50%) | Slow, Significant Declines | Low Impact: 5 | ||||||
|
|||||||||
Biological resource use | Hunting & trapping terrestrial animals - Intentional use (species is the target) | Timing | Scope | Severity | Impact | ||||
Ongoing | Majority (50-90%) | Slow, Significant Declines | Medium Impact: 6 | ||||||
|
|||||||||
Biological resource use | Logging & wood harvesting - Unintentional effects: (large scale) [harvest] | Timing | Scope | Severity | Impact | ||||
Ongoing | Majority (50-90%) | Rapid Declines | Medium Impact: 7 | ||||||
|
|||||||||
Biological resource use | Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest] | Timing | Scope | Severity | Impact | ||||
Ongoing | Minority (<50%) | Slow, Significant Declines | Low Impact: 5 | ||||||
|
Purpose | Scale |
---|---|
Food - human | subsistence, national |
Pets/display animals, horticulture | international |
Recommended citation
BirdLife International (2024) Species factsheet: Plain-pouched Hornbill Rhyticeros subruficollis. Downloaded from
https://datazone.birdlife.org/species/factsheet/plain-pouched-hornbill-rhyticeros-subruficollis on 23/12/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from
https://datazone.birdlife.org/species/search on 23/12/2024.