Data Zone
Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
| Critically Endangered | Endangered | Vulnerable |
|---|---|---|
| - | - | - |
| Year | Category | Criteria |
|---|---|---|
| 2018 | 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 | full migrant | Forest dependency | Medium |
| Land mass type | Average mass | - |
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence breeding/resident (km2) | 3,490,000 | |
| 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 | inferred | - | |
| 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 reported to be locally common in Sumatra and Borneo (del Hoyo et al. 1997).
Trend justification:
The species is tentatively assessed as being in decline due to habitat loss per Tracewski et al. (2016).
| 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 | ||||
| Thailand | N | Extant |
| Country/Territory | IBA Name |
|---|---|
| Malaysia | Lanjak Entimau Wildlife Sanctuary |
| Malaysia | Nakawan Range |
| Malaysia | Bintang Range |
| Malaysia | Pondok Tanjung Forest Reserve |
| Malaysia | Belum-Temenggor |
| Malaysia | Central Titiwangsa Range |
| Malaysia | Selangor Heritage Park |
| Malaysia | Tanjung Tuan |
| 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 | Kinabatangan floodplain |
| Malaysia | Tabin Wildlife Reserve |
| Malaysia | Kabili-Sepilok |
| Malaysia | Tanjung Datu-Samunsam Protected Area |
| Malaysia | Danum-Linau |
| Malaysia | Similajau National Park |
| Malaysia | Niah National Park |
| Malaysia | Lambir Hills National Park |
| Malaysia | Kelabit Highlands |
| Thailand | Bala Sector, Hala-Bala Wildlife Sanctuary |
| Thailand | Chaloem Pra Kiet (Pa Phru to Daeng) |
| Thailand | Khao Nor Chuchi |
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Artificial/Terrestrial | Pastureland | suitable | non-breeding |
| Artificial/Terrestrial | Pastureland | suitable | breeding |
| Artificial/Terrestrial | Rural Gardens | suitable | non-breeding |
| Artificial/Terrestrial | Rural Gardens | suitable | breeding |
| Forest | Subtropical/Tropical Moist Lowland | suitable | non-breeding |
| Forest | Subtropical/Tropical Moist Lowland | suitable | breeding |
| Altitude | 0 - 1400 m | Occasional altitudinal limits |
| Purpose | Primary form used | Life stage used | Source | Scale | Level | Timing |
|---|---|---|---|---|---|---|
| Pets/display animals, horticulture | - | - | International | Non-trivial | Recent |
Recommended citation
BirdLife International (2023) Species factsheet: Treron olax. Downloaded from
http://www.birdlife.org on 30/03/2023.
Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from
http://www.birdlife.org on 30/03/2023.
