Data Zone
Taxonomic note
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.
Sibley, C. G.; Monroe, B. L. 1990. Distribution and taxonomy of birds of the world. Yale University Press, New Haven, USA.
| Critically Endangered | Endangered | Vulnerable |
|---|---|---|
| - | - | - |
| Year | Category | Criteria |
|---|---|---|
| 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 (km2) | 3,340,000 | |
| Number of locations | - | |
| Severely Fragmented | - |
| Value | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| No. of mature individuals | unknown | not applicable | not applicable | 0 |
| Population trend | Decreasing | suspected | - | |
| Decline (3 years/1 generation past) | - | - | - | |
| Decline (5 years/1 generation past) | - | - | - | |
| Decline (10 years/1 generation past) | - | - | - | |
| Decline (10 years/3 generation future) | - | - | - | |
| Decline (10 years/3 generation past and future) | - | - | - | |
| Number of subpopulations | - | - | - | |
| Percentage in largest subpopulation | - | - | - | |
| Generation length (yrs) | 4.2 | - | - | - |
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).
Trend justification: The population is suspected to be in decline owing to ongoing habitat destruction.
| Country/Territory | Occurrence status | Presence | Resident | Breeding | Non-breeding | Passage |
|---|---|---|---|---|---|---|
| Brunei | N | Extant | Yes | |||
| Indonesia | N | Extant | Yes | |||
| Malaysia | N | Extant | Yes | |||
| Singapore | N | Extant | Yes | |||
| Thailand | N | Extant | Yes |
| Country/Territory | IBA Name |
|---|---|
| Malaysia | Nakawan Range |
| Malaysia | Bintang Range |
| Malaysia | Belum-Temenggor |
| Malaysia | Central Titiwangsa Range |
| Malaysia | Selangor Heritage Park |
| Malaysia | Endau-Rompin |
| Malaysia | Panti forest |
| Malaysia | Krau Wildlife Reserve |
| Malaysia | Kinabatangan floodplain |
| Malaysia | Danum Valley Conservation Area |
| Malaysia | Maliau Basin Conservation Area |
| Malaysia | Tabin Wildlife Reserve |
| Malaysia | Kabili-Sepilok |
| Malaysia | Tanjung Datu-Samunsam Protected Area |
| Malaysia | Gunung Pueh |
| Malaysia | Gunung Penrissen |
| Malaysia | Lanjak Entimau Wildlife Sanctuary |
| Malaysia | Similajau National Park |
| Malaysia | Niah National Park |
| Malaysia | Lambir Hills National Park |
| 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 | Occasional altitudinal limits |
Recommended citation
BirdLife International (2023) Species factsheet: Arachnothera crassirostris. Downloaded from
http://www.birdlife.org on 02/04/2023.
Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from
http://www.birdlife.org on 02/04/2023.
