LC
Thick-billed Spiderhunter Arachnothera crassirostris



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
2024 Least Concern
2016 Least Concern
2012 Least Concern
2009 Least Concern
2008 Least Concern
2004 Least Concern
2000 Lower Risk/Least Concern
1994 Lower Risk/Least Concern
1988 Lower Risk/Least Concern
Species attributes

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

Estimate Data quality
Extent of Occurrence (breeding/resident) 3,340,000 km2
Severely fragmented? no -
Population
Estimate Data quality Derivation Year of estimate
Population size unknown - - -
Population trend decreasing - suspected -
Generation length 3.38 years - - -

Population justification: The global population size has not been quantified, but the species is described as uncommon in Borneo and Thailand and rare on Sumatra (Cheke et al. 2001). This species is considered to have a medium dependency on forest habitat, and tree cover is estimated to have declined by 17.5% within its mapped range over the past 10 years (Global Forest Watch 2022, using Hansen et al. [2013] data and methods disclosed therein). Therefore, as a precautionary measure, it is tentatively suspected that this loss of cover may have led to a decline of between 1-19% in the species' population size over the same time frame.

Trend justification:   .


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
Singapore extant native yes
Thailand extant native yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Malaysia Belum-Temenggor
Malaysia Bintang Range
Malaysia Central Titiwangsa Range
Malaysia Danum Valley Conservation Area
Malaysia Endau-Rompin
Malaysia Gunung Penrissen
Malaysia Gunung Pueh
Malaysia Kabili-Sepilok
Malaysia Kinabatangan floodplain
Malaysia Krau Wildlife Reserve
Malaysia Lambir Hills National Park
Malaysia Lanjak Entimau Wildlife Sanctuary
Malaysia Maliau Basin Conservation Area
Malaysia Nakawan Range
Malaysia Niah National Park
Malaysia Panti forest
Malaysia Selangor Heritage Park
Malaysia Similajau National Park
Malaysia Tabin Wildlife Reserve
Malaysia Tanjung Datu-Samunsam Protected Area
Thailand Bala Sector, Hala-Bala Wildlife Sanctuary
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 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 Mangrove Vegetation Above High Tide Level marginal resident
Forest Subtropical/Tropical Moist Lowland suitable resident
Altitude 0 - 1350 m Occasional altitudinal limits  

Recommended citation
BirdLife International (2024) Species factsheet: Thick-billed Spiderhunter Arachnothera crassirostris. Downloaded from https://datazone.birdlife.org/species/factsheet/thick-billed-spiderhunter-arachnothera-crassirostris 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.