LC
Grey-backed Thrush Turdus hortulorum



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 67 g
Distribution

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 2,170,000
Extent of Occurrence non-breeding (km2) 1,560,000
Number of locations -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals unknown not applicable not applicable 0
Population trend Unknown not applicable -
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) 6.1 - - -

Population justification: The global population size has not been quantified, but the species is described as common during the breeding season in Russia and China, rare in North Korea, uncommon and local in South Korea, common to abundant in Hong Kong outside of the breeding season and uncommon to fairly common in Vietnam outside the breeding season (del Hoyo et al. 2005). National population estimates include: c.10,000-100,000 breeding pairs and c.50-10,000 individuals on migration in China; c.10,000-100,000 breeding pairs and c.1,000-10,000 individuals on migration in Korea and c.10,000-100,000 breeding pairs and c.1,000-10,000 individuals on migration in Russia (Brazil 2009).

Trend justification: The population trend is difficult to determine because of uncertainty over the impacts of habitat modification on population sizes.


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
China (mainland) N Extant
Hong Kong (China) N Extant
Japan V Extant
Macao (China) N Extant
North Korea N Extant Yes
Russia N Extant
Russia (Asian) N Extant
South Korea N Extant
Taiwan, China V Extant
Vietnam N Extant

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Lowland major non-breeding
Forest Temperate major breeding
Shrubland Subtropical/Tropical Moist suitable non-breeding
Shrubland Temperate suitable breeding
Altitude 0 - 1100 m Occasional altitudinal limits  

Utilisation
Purpose Primary form used Life stage used Source Scale Level Timing
Food - human - - Non-trivial Recent
Pets/display animals, horticulture - - International Non-trivial Recent

Recommended citation
BirdLife International (2022) Species factsheet: Turdus hortulorum. Downloaded from http://www.birdlife.org on 20/01/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 20/01/2022.