• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

Taxonomic note

Geokichla mendeni (del Hoyo and Collar 2016) was previously listed as Zoothera mendeni.

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.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2023	Near Threatened	B1b(iii); C1
2016	Near Threatened	C2a(i)
2012	Near Threatened	C2a(i)
2008	Near Threatened	C2ai
2006	Near Threatened
2004	Not Recognised
2000	Not Recognised
1994	Not Recognised
1988	Not Recognised

Migratory status	not a migrant	Forest dependency	high
Land-mass type		Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	19,000 km2	medium
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	2500-9999 mature individuals	medium	suspected	2022
Population trend	decreasing	poor	suspected	2016-2027
Rate of change over the past 10 years/3 generations (longer of the two periods)	5-15%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	5-15%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	5-15%	-	-	-
Generation length	3.58 years	-	-	-
Number of subpopulations	2	-	-	-
Percentage of mature individuals in largest subpopulation	1-89%	-	-	-

Population justification: There is no population size estimate available for this species. Eaton et al. (2021) describe it as 'fairly common' and 'rare' on Peleng and Taliabu respectively. The total area of suitable habitat is relatively small (c.2,600 km²) and the majority of this (c.60%) is on Taliabu where the species is evidently very scarce. Consequently, the population size is precautionarily suspected to be small, and could number below 10,000 mature individuals; it is therefore set here in the band of 2,500-9,999.

Trend justification: Over the past three generations (10.74 years; Bird et al. 2020), forest cover in this species' range was reduced by 9-12% (Global Forest Watch 2022, based on data from Hansen et al. [2013] and methods disclosed therein). Although (on Peleng at least) the species can persist in lightly degraded forest, forest loss is assumed to have caused a reduction in the population size of 5-15% over this period. In the absence of any clear indication that rates of forest loss are slowing, this rate of reduction is also suspected to occur in the next three generations.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Indonesia	extant	native	yes

Country/Territory	IBA Name

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Lowland	major	resident
Altitude	0 - 1000 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Biological resource use	Hunting & trapping terrestrial animals - Intentional use (species is the target)	Timing		Scope		Severity		Impact
		Ongoing		Unknown		Unknown		Unknown
		Stresses Species mortality
Biological resource use	Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion

Purpose	Scale
Pets/display animals, horticulture

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Recommended citation
BirdLife International (2024) Species factsheet: Red-and-black Thrush Geokichla mendeni. Downloaded from https://datazone.birdlife.org/species/factsheet/red-and-black-thrush-geokichla-mendeni on 24/11/2024.
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 24/11/2024.