LC
Slender-billed Oriole Oriolus tenuirostris



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
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
Species attributes

Migratory status full migrant Forest dependency medium
Land-mass type Average mass -
Range

Estimate Data quality
Extent of Occurrence (breeding/resident) 1,600,000 km2
Extent of Occurrence (non-breeding) 2,000,000 km2
Severely fragmented? no -
Population
Estimate Data quality Derivation Year of estimate
Population size unknown - - -
Population trend decreasing - inferred -
Generation length 3.7 years - - -

Population justification: The global population size has not been quantified, but the species is described as scarce in Nepal, uncommon in India and locally fairly common in Bhutan (Grimmett et al. 1998)

Trend justification:

The species is tentatively assessed as being in decline due to habitat loss per Tracewski et al. (2016) and unsustainable levels of hunting.


Country/territory distribution
Country/Territory Presence Origin Resident Breeding visitor Non-breeding visitor Passage migrant
Bangladesh extant native yes
Bhutan extant native yes
China (mainland) extant native yes
India extant native
Laos extant native yes
Myanmar extant native yes
Nepal extant native yes
Sri Lanka extant vagrant yes
Thailand extant native yes
Vietnam extant native yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Laos Phou Loeuy
India Barail Wildlife Sanctuary
India Barail Range forests
Vietnam Bi Dup
Vietnam Tuyen Lam
Thailand Doi Chiang Dao
Thailand Doi Inthanon
Thailand Doi Suthep-Pui
Thailand Kaeng Krachan
Thailand Mae Fang
Thailand Mae Jarim National Park
Thailand Nanthaburi
Thailand Thung Yai - Naresuan
Thailand Umphang

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Subtropical/Tropical Heavily Degraded Former Forest suitable non-breeding
Artificial/Terrestrial Subtropical/Tropical Heavily Degraded Former Forest suitable breeding
Forest Subtropical/Tropical Dry major non-breeding
Forest Subtropical/Tropical Dry major breeding
Forest Subtropical/Tropical Moist Lowland suitable non-breeding
Forest Subtropical/Tropical Moist Lowland suitable breeding
Forest Subtropical/Tropical Moist Montane suitable non-breeding
Forest Subtropical/Tropical Moist Montane suitable breeding
Altitude   Occasional altitudinal limits  

Utilisation
Purpose Primary form used Life stage used Source Scale Level Timing
Pets/display animals, horticulture - - international non-trivial recent

Recommended citation
BirdLife International (2024) Species factsheet: Oriolus tenuirostris. Downloaded from https://datazone.birdlife.org/species/factsheet/slender-billed-oriole-oriolus-tenuirostris on 26/02/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org on 26/02/2024.