• 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., Fishpool, L.D.C., Boesman, P. and Kirwan, G.M. 2016. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 2: Passerines. Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, UK.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2023	Least Concern
2016	Near Threatened	A2c+3c+4c
2012	Near Threatened	A2c+3c+4c
2008	Near Threatened	A2c; A3c; A4c
2004	Near Threatened
2000	Lower Risk/Near Threatened
1994	Lower Risk/Least Concern
1988	Near Threatened

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	601,000 km2	medium
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	-	-	-
Population trend	decreasing	poor	inferred	2010-2023
Rate of change over the past 10 years/3 generations (longer of the two periods)	5-9%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	5-15%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	5-9%	-	-	-
Generation length	4.14 years	-	-	-
Number of subpopulations	1	-	-	-
Percentage of mature individuals in largest subpopulation	100%	-	-	-

Population justification: The population size of this species has not been quantified. However, forest in its mapped range covers c.140,000 km², such that its population is likely to be relatively large, even if only a small proportion of this is occupied. In some areas (especially Sabah) the species appears to be rather scarce, however in Sarawak it can be locally very common (Mann 2008, Bruce 2020, eBird 2022).

Trend justification: Although there is little doubt that this species' preference for submontane forest buffers it from the worst of Sundaic forest loss, nonetheless it is likely to be impacted, especially at the lower limits of its elevational range. Vast swathes of habitat do remain however, especially in Kalimantan. In the three generations (12.4 years; Bird et al. 2020) to 2021, forest cover in this species' range was reduced by 5-6% (Global Forest Watch 2022, based on data from Hansen et al. [2013] and methods disclosed therein). This is thought to be broadly representative of population declines, which may in fact be steeper than remote sensing data alone suggest. The population decline is therefore suspected to have been equivalent to 5-9% in the past three generations and, based on slightly accelerated (equivalent to 7-8% losses) deforestation between 2016 and 2021, to 5-15% in the next three generations.

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

Country/Territory	IBA Name
Indonesia	Betung Kerihun
Indonesia	Kayan Mentarang
Indonesia	Ulu Telen
Malaysia	Baleh headwaters
Malaysia	Danum-Linau
Malaysia	Dulit Range
Malaysia	Hose-Laga mountains
Malaysia	Kelabit Highlands
Malaysia	Lanjak Entimau Wildlife Sanctuary
Malaysia	Mount Kinabalu
Malaysia	Mulu - Buda Protected Area
Malaysia	Trus Madi Range
Malaysia	Usun Apau plateau

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Lowland	major	resident
Forest	Subtropical/Tropical Moist Montane	major	resident
Altitude	600 - 1220 m	Occasional altitudinal limits	(max) 1680 m

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
Agriculture & aquaculture	Wood & pulp plantations - Small-holder plantations	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Biological resource use	Logging & wood harvesting - Unintentional effects: (large scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses 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

---

Recommended citation
BirdLife International (2024) Species factsheet: Hose's Broadbill Calyptomena hosii. Downloaded from https://datazone.birdlife.org/species/factsheet/hoses-broadbill-calyptomena-hosii on 23/11/2024.
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 23/11/2024.