Data Zone
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.
| Critically Endangered | Endangered | Vulnerable |
|---|---|---|
| - | - | - |
| 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 |
| Migratory status | not a migrant | Forest dependency | medium |
| Land-mass type | Average mass | - |
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence (breeding/resident) | 3,340,000 km2 | |
| Severely fragmented? | no | - |
| 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 | 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 |
| 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 |
| 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 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.