• 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
2020	Near Threatened	C2a(i)
2016	Near Threatened	A2c+3c+4c
2012	Near Threatened	A2c+3c+4c
2008	Near Threatened	A2c; A3c; A4c
2005	Near Threatened
2004	Not Recognised
2000	Not Recognised
1994	Not Recognised
1988	Not Recognised

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	212,000 km2	medium
Number of locations	11-100	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	2500-9999 mature individuals	poor	-	2020
Population trend	decreasing	poor	inferred	2014-2031
Rate of change over the past 10 years/3 generations (longer of the two periods)	10-20%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	10-20%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	10-20%	-	-	-
Generation length	5.8 years	-	-	-
Number of subpopulations	2-5	-	-	-

Population justification: The area of suitable habitat predicted for the species in Thailand by Trisurat et al. (2013) was 1,864 km², which, at the densities reported for this species of 2-5 individuals per km² would result in an initial estimate of 3,700-9,300 individuals, assumed to equate to 2,479-6,231 mature individuals, rounded to 2,450-6,000 mature individuals. No more than an additional 500 are believed to be present in Myanmar (Lay Win in litt. 2020). As such, the population is placed in the band of 2,500-10,000 mature individuals. 

Data is urgently required on this species's population size. Given the dwindling area of suitable primary forest habitat within its range, its population size could be small.

Trend justification: The species is suspected to be undergoing a population reduction in the range of 10-20%, largely driven by the rate of forest loss recorded within the range of the species, with likely additional impacts from habitat degradation and loss due to selective logging, and opportunistic hunting. Global Forest Change data on tree cover loss up to 2019 indicate that, over three generations (17.4 years), approximately 8.8% of tree cover with >30% canopy cover was lost from within the species’s range (Global Forest Watch 2020). The species is dependent on large trees within intact forest, and within the range the area of forest has been reduced (Global Forest Watch 2020), large trees are selectively logged and numerous roads have been constructed within the past ten years in conjunction with increasing rates of agricultural encroachment, at least in Myanmar (Lay Win in litt. 2020). The species does not occur in cleared areas (Trisurat et al. 2013). However it is not a species targeted by hunters, although it will be opportunistically hunted (Lay Win in litt. 2020). From this, the population is inferred to be suffering a continuing decline.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Myanmar	extant	native		yes
Thailand	extant	native		yes

Country/Territory	IBA Name
Thailand	Khao Yai

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Lowland	major	resident
Forest	Subtropical/Tropical Moist Montane	suitable	resident
Altitude	0 - 1500 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		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Wood & pulp plantations - Agro-industry plantations	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		Unknown		Unknown		Unknown
		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 Species disturbance, Ecosystem degradation
Biological resource use	Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation, Ecosystem conversion
Natural system modifications	Fire & fire suppression - Increase in fire frequency/intensity	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: Tickell's Brown Hornbill Anorrhinus tickelli. Downloaded from https://datazone.birdlife.org/species/factsheet/tickells-brown-hornbill-anorrhinus-tickelli on 22/12/2024.
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 22/12/2024.