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

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.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	A2cd+3cd+4cd

Red List history

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
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Annual & perennial non-timber crops - Small-holder farming	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
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
		Stresses Species mortality
Biological resource use	Logging & wood harvesting - Unintentional effects: (large scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Rapid Declines		Medium Impact: 7
		Stresses Species disturbance, Ecosystem degradation, Ecosystem conversion
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
		Stresses Ecosystem degradation

Purpose	Scale
Food - human	subsistence, national
Pets/display animals, horticulture	international

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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 22/11/2024.
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 22/11/2024.