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 | altitudinal migrant | Forest dependency | high |
| Land-mass type | Average mass | 7 g |
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence (breeding/resident) | 2,680,000 km2 | |
| Extent of Occurrence (non-breeding) | 1,810,000 km2 | |
| Severely fragmented? | no | - |
| Estimate | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| Population size | unknown | - | - | - |
| Population trend | decreasing | - | suspected | - |
| Generation length | 1.9 years | - | - | - |
Population justification: The global population size has not been quantified, but the species is reported to be locally common (Baker 1997). This species is considered to have a high dependency on forest habitat, and tree cover is estimated to have declined by 7.5% within its mapped range over the past 10 years (Global Forest Watch 2022, using Hansen et al. [2013] data and methods disclosed therein). It is therefore tentatively suspected that this rate of cover loss may have led to a decline of between 1-19% in the species' population size over the same time frame, with a best estimate of reduction being 5-9%.
Trend justification: .
| Country/Territory | Presence | Origin | Resident | Breeding visitor | Non-breeding visitor | Passage migrant |
|---|---|---|---|---|---|---|
| Bangladesh | extant | native | yes | |||
| Bhutan | extant | native | ||||
| China (mainland) | extant | native | ||||
| India | extant | native | ||||
| Laos | extant | native | ||||
| Myanmar | extant | native | ||||
| Nepal | extant | native | ||||
| Thailand | extant | native | ||||
| Vietnam | extant | native |
| Country/Territory | IBA Name |
|---|---|
| Laos | Eastern Bolikhamxay Mountains |
| Laos | Nakai-Nam Theun |
| Laos | Nam Ha |
| Laos | Phou Loeuy |
| Nepal | Makalu Barun National Park |
| Thailand | Doi Chiang Dao |
| Thailand | Doi Inthanon |
| Thailand | Doi Phukha |
| Thailand | Doi Suthep-Pui |
| Thailand | Huai Kha Khaeng |
| Thailand | Mae Fang |
| Thailand | Mae Jarim National Park |
| Thailand | Mae Lao - Mae Sae |
| Thailand | Umphang |
| Vietnam | Ban Thi - Xuan Lac |
| Vietnam | Chu Yang Sin |
| Vietnam | Du Gia |
| Vietnam | Fan Si Pan |
| Vietnam | Pu Mat |
| Vietnam | Sinh Long |
| Vietnam | Tam Dao |
| Vietnam | Tay Con Linh |
| Vietnam | Van Ban |
| Vietnam | Vu Quang |
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Forest | Subtropical/Tropical Moist Lowland | major | non-breeding |
| Forest | Subtropical/Tropical Moist Montane | major | breeding |
| Wetlands (inland) | Permanent Freshwater Marshes/Pools (under 8ha) | suitable | resident |
| Wetlands (inland) | Permanent Rivers/Streams/Creeks (includes waterfalls) | suitable | resident |
| Altitude | 900 - 2700 m | Occasional altitudinal limits |
| Purpose | Scale |
|---|---|
| Pets/display animals, horticulture | subsistence, national |
Recommended citation
BirdLife International (2024) Species factsheet: Slaty-bellied Tesia Tesia olivea. Downloaded from
https://datazone.birdlife.org/species/factsheet/slaty-bellied-tesia-tesia-olivea on 23/11/2024.
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 23/11/2024.