NT
Green Broadbill Calyptomena viridis



Taxonomy

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.

IUCN Red List criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - -

Red List history
Year Category Criteria
2022 Near Threatened A2c+3c+4c
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 Lower Risk/Least Concern
Species attributes

Migratory status not a migrant Forest dependency medium
Land-mass type continent
shelf island
Average mass -
Range

Estimate Data quality
Extent of Occurrence (breeding/resident) 4,240,000 km2 medium
Severely fragmented? no -
Population
Estimate Data quality Derivation Year of estimate
Population size unknown - - -
Population trend decreasing poor inferred 2016-2029
Rate of change over the past 10 years/3 generations (longer of the two periods) 20-29% - - -
Rate of change over the future 10 years/3 generations (longer of the two periods) 20-29% - - -
Rate of change over the past & future 10 years/3 generations (longer of the two periods) 20-29% - - -
Generation length 4.17 years - - -
Number of subpopulations 5-15 - - -
Percentage of mature individuals in largest subpopulation 1-89% - - -

Population justification: The population size of this species has not been quantified; it is considered fairly common to locally common (Eaton et al. 2021, eBird 2022).

Trend justification: Studies have revealed marked declines in density of this species following forest logging activities (del Hoyo et al. 2003). Remote sensing data indicate that in the three generations (12.6 years; Bird et al. 2020) to 2021, forest cover in this species' range was reduced by c.25% (Global Forest Watch 2022, based on data from Hansen et al. 2013 and methods disclosed therein). Although this species is tolerant of some degraded habitat, including overgrown plantations, this figure is thought to be broadly representative of the reduction in population size over the last three generations (set here to 20-29%). The same rate of reduction is suspected to occur in the future, with little sign of Sundaic lowland forest loss abating.


Country/territory distribution
Country/Territory Presence Origin Resident Breeding visitor Non-breeding visitor Passage migrant
Brunei extant native yes
Indonesia extant native yes
Malaysia extant native yes
Myanmar extant native yes
Singapore extant native yes
Thailand extant native yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Malaysia Nakawan Range
Malaysia Ulu Muda
Malaysia Bintang Range
Malaysia Belum-Temenggor
Malaysia Kledang Range
Malaysia Central Titiwangsa Range
Malaysia Selangor Heritage Park
Malaysia Endau-Rompin
Malaysia Panti forest
Malaysia Krau Wildlife Reserve
Malaysia Taman Negara National Park
Malaysia South-east Pahang peat swamp forest
Malaysia Crocker Range
Malaysia Mount Kinabalu
Malaysia Trus Madi Range
Malaysia Danum Valley Conservation Area
Malaysia Maliau Basin Conservation Area
Malaysia Tabin Wildlife Reserve
Malaysia Kabili-Sepilok
Malaysia Kulamba Wildlife Reserve
Malaysia Tanjung Datu-Samunsam Protected Area
Malaysia Gunung Pueh
Malaysia Bako-Buntal Bay
Malaysia Gunung Penrissen
Malaysia Lanjak Entimau Wildlife Sanctuary
Malaysia Danum-Linau
Malaysia Similajau National Park
Malaysia Niah National Park
Malaysia Lambir Hills National Park
Malaysia Mulu - Buda Protected Area
Thailand Bala Sector, Hala-Bala Wildlife Sanctuary
Thailand Bu Do - Sungai Padi
Thailand Chaloem Pra Kiet (Pa Phru to Daeng)
Thailand Hala Sector, Hala-Bala Wildlife Sanctuary and Bang Lang National Park
Thailand Kaeng Krachan
Thailand Khao Banthad
Thailand Khao Luang
Thailand Khao Nor Chuchi
Thailand Thaleban

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Plantations suitable resident
Forest Subtropical/Tropical Moist Lowland major resident
Forest Subtropical/Tropical Moist Montane suitable resident
Forest Subtropical/Tropical Swamp suitable resident
Altitude 0 - 1700 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops - Agro-industry farming Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
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 Majority (50-90%) Slow, Significant Declines Medium Impact: 6
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%) Negligible declines Low Impact: 5
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
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 Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation

Utilisation
Purpose Primary form used Life stage used Source Scale Level Timing
Pets/display animals, horticulture - - international non-trivial recent

Recommended citation
BirdLife International (2024) Species factsheet: Calyptomena viridis. Downloaded from https://datazone.birdlife.org/species/factsheet/green-broadbill-calyptomena-viridis on 23/02/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org on 23/02/2024.